Learn English Pronunciation Rules with Katakana

A complete guide to sound changes — why English doesn’t sound the way it’s spelled

Introduction: Why Doesn’t English Sound the Way It’s Written in the Dictionary?

Have you ever felt like “I memorized the words perfectly, but I still can’t understand a thing when listening”? In reality, native speakers almost never pronounce words exactly the way they appear in the dictionary.

1. The Real Cause of Sound Change: “Energy Saving”

When native speakers link sounds together or drop them, they aren’t being “lazy” in a bad sense. They change sounds in order to communicate smoothly and rhythmically with minimal effort — it’s essentially an “energy-saving mode” for the mouth. It’s a smart way of efficiently handling sound sequences that are physically awkward to pronounce.

2. Why This Is Worth Learning

Once you understand this “energy-saving mechanism” (the rules of sound change), your listening ability will improve dramatically. In listening tests, sounds you once thought had simply “disappeared” turn out to have changed according to predictable rules. Any sound you can produce yourself, you can also recognize by ear. This database is the ultimate weapon for turning your listening skill from “guesswork” into “certainty.”

3. How the Rules Are Organized

What follows is both a “dictionary” and a “strategy guide” that systematically organizes a huge amount of data. Don’t try to memorize everything at once — instead, refer back to it whenever you hit a wall during listening practice and think “I can’t catch that!”

Let’s start with the basic rules of “strong and weak forms,” the foundation for all the sound changes to come!

Chapter 1: Mastering Strong and Weak Forms

English words have a “strong form,” used when the word is emphasized on its own, and a “weak form,” used lightly within a sentence to keep the rhythm smooth.

Why does the weak form exist? Because replacing the vowel of low-importance words in a sentence (articles, pronouns, prepositions, etc.) with the vague “schwa” sound [ə] — the sound requiring the least muscular effort — conserves energy and lets the important words stand out.

Strong / Weak Form List (by Part of Speech)

Next, let’s look at “linking,” where sounds connect across word boundaries.

Chapter 2: Consonant + Vowel Linking

When the previous word ends in a consonant and the next word begins with a vowel, the two combine to sound like a single new word. This is because it’s more “energy-efficient” to keep the breath flowing into the next sound than to stop and restart it.

Phrase Collection by Pattern

[p, b, t, d + vowel]

• 🔊keep it ➡ キーピッ
• 🔊help us ➡ ヘルパス
• 🔊top of ➡ トッパ
• 🔊rub it ➡ ラビッ
• 🔊job I’ve ➡ ジョバイヴ
• 🔊went out ➡ ウェンタウ
• 🔊left arm ➡ レフターム
• 🔊packed up ➡ パックタ
• 🔊hand over ➡ ハンドウヴァー
• 🔊rode at ➡ ロウダッ
• 🔊send it ➡ センディッ

[d + i]

• 🔊did it ➡ ディディッ
• 🔊changed it ➡ チェインジディッ
• 🔊mend it ➡ メンディッ

[s + i]

• 🔊thinks it ➡ スィンクスィッ
• 🔊takes it ➡ テイクスィッ
• 🔊sets in ➡ セッツィン
• 🔊laughs it ➡ ラフスィッ
• 🔊place it ➡ プレイスィッ
• 🔊oasis in ➡ オエイスィスィン

[θ, s + vowel]

• 🔊breath of ➡ ブレサ
• 🔊aftermath of ➡ アフターマサ
• 🔊month after ➡ マンサフタ
• 🔊fifth anniversary ➡ フィフサニヴァーサリー
• 🔊It’s a ➡ イッツァ
• 🔊glass of ➡ グラスア
• 🔊sense of ➡ センスア
• 🔊obvious in ➡ アーッヴィアスィン

[tʃ, f + vowel]

• 🔊which is ➡ ウィッチィズ
• 🔊clutch at ➡ クラチャッ
• 🔊which of ➡ ウィッチャ
• 🔊laugh at ➡ ラーファッ
• 🔊tough enough ➡ タフィナフ
• 🔊puff at ➡ パファッ

[g, k + vowel]

• 🔊mug of ➡ マガ
• 🔊big apple ➡ ビガポー
• 🔊egg a ➡ エガ
• 🔊leg of ➡ レガ
• 🔊pick it ➡ ピキッ
• 🔊look it ➡ ルキッ
• 🔊check it ➡ チェキッ
• 🔊ask him ➡ アスキ(ㇺ)

[z + i]

• 🔊has it ➡ ハズィッ
• 🔊explains it ➡ イクスプレインズィッ
• 🔊uses it ➡ ユーズィズィッ
• 🔊lose it ➡ ルーズィッ
• 🔊does it ➡ ダズィッ

These sound completely different from the words spoken in isolation, but once you know the rule, there’s nothing to fear. Next, let’s move into the world of “blending and change,” where neighboring sounds transform into something else entirely.

Chapter 3: Consonant + Consonant Blending & Change (Assimilation, Fusion, Elision)

“Elision,” where one sound disappears when similar sounds occur in a row, and “palatalization,” where a sound changes under the influence of a following y sound, are both advanced energy-saving techniques for shortening how far the tongue has to travel.

1. Sequences of Identical or Similar Consonants

Because the tongue stays fixed in the same position to produce the next sound, the preceding consonant effectively disappears from what you hear.

[p+p], [k+k], [s+s], [s+ʃ]

• 🔊deep pond ➡ ディーパンド
• 🔊keep playing ➡ キープレイン
• 🔊sleep peacefully ➡ スリーピースフリー
• 🔊black coffee ➡ ブラッカーフィー
• 🔊take care ➡ テイッケア
• 🔊ask Kate ➡ アスケイト
• 🔊this store ➡ ディストア
• 🔊less salt ➡ レソルト
• 🔊walks slowly ➡ ウォークスロゥリー
• 🔊this shop ➡ ディシャップ
• 🔊this ship ➡ ディシップ
• 🔊tennis shoes ➡ テニシューズ

did they

• 🔊did they ➡ ディッデイ

[d+d], [d+t], [d+v]

• 🔊beyond description ➡ ビヨンディスクリプション
• 🔊calmed down ➡ カームダウン
• 🔊beyond time ➡ ビヨンタイム
• 🔊seemed very ➡ スゥイー(ㇺ)ヴェリィ

[d+ð]

• 🔊would this ➡ ウッディス
• 🔊send the ➡ センザ
• 🔊second the ➡ セカンザ

[z+t] *z devoices to s

• 🔊loves Tom ➡ ラブストム
• 🔊goes to ➡ ゴウストゥ
• 🔊was to ➡ ヮストゥ
• 🔊Yours truly ➡ ユアーストゥルーリー

have been

• 🔊have been ➡ ハビン

2. Complete List of Fusion with y (j) — Palatalization

This is the most important and frequent change, occurring especially when you or your follows.

[t + j]

• 🔊met your ➡ メッチャー
• 🔊what you ➡ ワッチュー
• 🔊forget you ➡ フォーゲッチュー
• 🔊suit your ➡ スーチャー
• 🔊don’t you ➡ ドンチュ
• 🔊didn’t you ➡ ディドゥンチュ

[d + j]

• 🔊could you ➡ クヂュ / クジュ
• 🔊would you ➡ ウヂュ / ウジュ
• 🔊mend your ➡ メンヂャ
• 🔊did you ➡ ディヂュ / ディジュ / ディジャ
• 🔊spend your ➡ スペンヂャ

[s + j]

• 🔊this yours ➡ ディシャーズ
• 🔊likes Yorkshire ➡ ライクショークシャー
• 🔊bless you ➡ ブレシュ
• 🔊pass your ➡ パシャ
• 🔊miss you ➡ ミシュ
• 🔊chase you ➡ チェイシュ
• 🔊express your ➡ イクスプレシャ

[z + j]

• 🔊is yours ➡ ジャーズ
• 🔊as you ➡ ァジュ / ァジャ
• 🔊was you ➡ ヮジュ / ヮジャ
• 🔊does your ➡ ダジャー

[ts + j], [l + j]

• 🔊what’s your ➡ ワッチャー
• 🔊what’ll you ➡ ワラリュ / ワラリャ

[f, k, m, p, n, v, ŋ + j]

• 🔊half used ➡ ハーフューズドゥ
• 🔊proof you ➡ プル―ヒュー
• 🔊knife yours ➡ ナイフュアズ
• 🔊if you ➡ イフュ
• 🔊rough year ➡ ラフィヤー
• 🔊roof useless ➡ ルーフュースレス
• 🔊thank you ➡ サンキュー
• 🔊take you ➡ テイキュー
• 🔊welcome you ➡ ウェルカミュー
• 🔊come yet ➡ カミェッ
• 🔊time you ➡ タイミュー
• 🔊some yachts ➡ サミャッツ
• 🔊some young ➡ サミャン
• 🔊some useful ➡ サミュースㇷ
• 🔊keep you ➡ キーピュー
• 🔊help yourself ➡ ヘルピュアセルㇷ
• 🔊stop yawning ➡ ストッ( )ヨーニン
• 🔊top university ➡ トッ( )ィニバーシティ
• 🔊help you ➡ ヘルピュー
• 🔊stop your ➡ ストッピョア
• 🔊on your ➡ オニャ
• 🔊ten years ➡ テンニヤーズ
• 🔊soon use ➡ スーンニューズ
• 🔊join you ➡ ジョインニュ
• 🔊can you ➡ キャニュ
• 🔊on you ➡ オニュ
• 🔊have you ➡ ハヴュ
• 🔊of you ➡ オヴュ
• 🔊leave your ➡ リーヴィャ
• 🔊of your ➡ オヴィャ
• 🔊drive you ➡ ドゥライヴュ
• 🔊leave you ➡ リーヴュ
• 🔊ring you ➡ リンギュ / リンニュ
• 🔊telling you ➡ テリンギュ / テリニュ
• 🔊sting your ➡ スティンギャ / スティンニャ

Next, let’s look at reduction — the phenomenon where certain sounds get completely “skipped.”

Chapter 4: Sounds That Get “Lazy” — Reduction (Elision)

Sounds like “t” and “h,” which require a lot of breath to produce, are often completely ignored in fast speech. This too can be called the ultimate form of “energy saving.”

1. Deletion of [t + consonant]

This change is based on a historical trend, dating back to around the 1600s, that “t and d are hard to pronounce” in these positions.

• 🔊first place ➡ ファースプレイス
• 🔊went back ➡ ウェンバック
• 🔊last song ➡ ラスソング
• 🔊washed the ➡ ウォッシュザ
• 🔊crossed the ➡ クロスザ

2. Loss of Word-Initial [h]

The weak h in pronouns disappears entirely when it links with the preceding word.

• 🔊did he ➡ ディディ
• 🔊is he ➡ イズィ
• 🔊has he ➡ ハズィ
• 🔊told her ➡ トールダー
• 🔊for her ➡ ファアー
• 🔊doesn’t he ➡ ダズニィ
• 🔊didn’t he ➡ ディドゥニィ
• 🔊who’s ➡ フーズ
• 🔊what’s his ➡ ワッツィズ
• 🔊what’s he ➡ ワッツィー
• 🔊what’ll he ➡ ワラリィ

3. Loss of the g in -ing

This change omits the motion of raising the back of the tongue needed for “g.”

• 🔊playing ➡ プレイン
• 🔊going ➡ ゴーイン

4. The [n + ð] → “nna” Reduction

This phenomenon skips the motion of placing the tongue tip between the teeth for [ð], substituting the nearby [n] position instead.

• 🔊in the ➡ インナ
• 🔊on the ➡ オンナ
• 🔊begin the ➡ ビギンナ
• 🔊open the ➡ オープンナ
• 🔊taken the ➡ テイクンナ
• 🔊on this ➡ オンニス

Next, let’s explain “flapping,” a feature unique to American English in which sounds become voiced or turn into a tapped r-like sound.

Chapter 5: T-Voicing & Flapping (Tapping)

A T sound sandwiched between vowels stops being released with a strong burst of air, and is instead pronounced while the vocal cords keep vibrating. This is why it can sound like a Japanese “ra-row” (r) sound to Japanese ears.

Voicing (T ➡ D)

• 🔊send it airmail ➡ センディッデアメイル
• 🔊get away ➡ ゲダウェイ
• 🔊cut it out ➡ カディダウ
• 🔊not at all ➡ ノダドー
• 🔊look it up ➡ ルキダッ
• 🔊check it over ➡ チェキドウヴァ―
• 🔊what is ➡ ワディズ

Flapping (Tapping)

• 🔊get away ➡ ゲラウェイ
• 🔊cut it out ➡ カリラウ
• 🔊not at all ➡ ノラロー
• 🔊it’ll ➡ イドゥル / イル
• 🔊that’ll ➡ ザドゥル / ザル
• 🔊what’ll ➡ ワラル / ワロゥ

Finally, let’s master the real sound of “contractions,” which appear more often than anything else in listening.

Chapter 6: Real Pronunciation Database of Contractions

Even spellings you’re used to seeing in textbooks are pronounced with even more “energy-saving” shortcuts in real speech.

Conclusion