Main spellings (~95%)
⟨t⟩ ~93%
The letter ⟨t⟩ covers most words with the /t/ sound.
Doubled consonants: When ⟨tt⟩ appears in the middle of a word, it still makes just one /t/ sound. Examples: better, little, matter.
⟨ed⟩ ~2%
The past tense ending ⟨-ed⟩ is pronounced /t/ after voiceless consonants (/p/, /k/, /f/, /s/, /ʃ/, /ʧ/).
-ed pronunciation rule: Say /t/ after voiceless sounds (walked, stopped), say /d/ after voiced sounds (called, played), and say /ɪd/ after /t/ or /d/ (wanted, needed).