My teacher has taught English for 14 years

->Mỹ teacher began

Did you always eat sweets when you were small?

->Did you use

`1.` My teacher began teaching English `14` years ago.

- S + have/has + Vpp + for + khoảng thời gian

- S + begin + V-ing/to V + khoảng thời gian + ago.

`2.` Dis you use to eat sweets?

*Used to : đã từng làm gì

(+) S + used to + bare infi

(-) S + didn't use to + bare infi

(?) Did + S + use to + bare infi