$1.$ An extended family has three or four generations.

- S + have/ has + ...

$2.$ Daisy isn't allowed to go to work on foot.

- S + is/ are + (not) + V (Pii) + (by O).

- allowed + to V: đượ cho phép làm gì.

- go on foot (v.): đi bộ.

$3.$ It is good for health to do exercises regularly.

- S + tobe + adj + to V.

$4.$ Our share of housework is done willingly by us.

- S + is/ are + (not) + V (Pii) + (by O).

$5.$ Peter has played piano since he was 6 years old.

- S + have/ has + V3.

- since + Mốc thời gian.

$6.$ It takes him an hour to do his homework.

- It takes + O + time + to V.

$7.$ There are two bedrooms in the flat.

- There are + Plural Nouns.

$8.$ He arrived while we were having lunch.

- Kết hợp thì quá khứ đơn và thì quá khứ tiếp diễn để diễn tả một hành động đang xảy ra thì hành động khác xen vào.

$9.$ This is the first time they have ever seen that film.

- This is the time + S + have/ has + V3.

$10.$ Peter has played piano since he was 6 years old.

- S + have/ has + V3.

- since + Mốc thời gian.