`1.`

`a.` Tan used to live on the farm when he was a small boy

`b.` We didn't use to have electricity when we lived in that country

`c.` Did they use to visit home village last year?

`d.` Mr Cuong used to phone me in 1973 

`e.` Houses used to be cheap last month

`f.` Streets didn't use to be noisy at night

`g.` I used to swim in that river

`h.` They used to leave Nha Trang when they was business men

*Cấu trúc "used to"

`(+)` S + used to + V_inf

`(-  )` S + didn't + use to + V_inf

`(?   )` Did + S + use to + V_inf?

`2.` 

`-` /id/: needed, fitted, decided, wanted

`-` /t/: stopped, escaped, asked

`-` /d/: used, appeared, stayed, grazed, tired, owned, lived, married

*Phát âm /id/ khi tận cùng bằng các chữ: t, d

*Phát âm /t/ khi tận cùng bằng các chữ: s, p, k, x, th, gh, ch, c, sh

*Phát âm /d/ khi tận cùng bằng các chữ còn lại