I.

$\text{/id/:}$ wanted, regreted, visited, added, started, ended, waited, counted, posted, fitted, invited, decided, sorted, demanded, collected.

$\text{/t/:}$ closed, helped, looked, watched, cooked, pushed, liked, laughed, finished, kissed, brushed.

$\text{/d/:}$ còn lại: arrived, hurried, robbed, lived, travelled, tidied, changed, behaved, boiled, named, borrowed, climbed, studied.

$\text{→}$ Khi có -y thì bỏ -y thêm -ied

$\text{→}$ nếu có sẵn -e thì thêm -d

$\text{→}$ với 1 vài từ kết thúc bằng phụ âm, khi trước nó là 1 nguyên âm thì nhân đôi phụ âm rồi thêm -ed

/id/: want, regret, add, start, end, wait, count, post, fit, sort, demand, collect, visit, invite, decide

/t/: close, help, look, watch, cook, push, like, laugh, finish, kiss, brush

/d/: rob, live, tidy, change, open, behave, boil, name, borrow, climb, study, demand