Câu `1` và `2` đã làm trước đó (7016511) rồi nhé:

`Ex3`:

`1`. Could he walk when he was one `?`

`2`. Could she write your name when she was three `?`

`3`. Could they read when they were two `?`

`4`. Could Tom count from one to ten when he was two `?`

`5`. Could Mary talk when she was three `?`

`6`. Could he ride a bike when he was six `?`

`7`. Could we swim when we were five `?`

`----------`

`@` Cấu trúc:

`-` Could + S + V-bare `?`: Ai đó có thể làm gì...

 `@` Cấu trúc quá khứ đơn (Past Simple):

`-` Đối với động từ tobe: 

`(+)` S + was/were + adj/N

`(-)` S + was/were + not + adj/N

`(?)` Was/Were + S + adj/N `?`

`-`  I/He/She/It/Tên riêng/N số ít  `->` dùng "was"

`-`  They/We/You/N số nhiều `->` dùng "were"