Giúp vs ạ cảm ơn nhieuuuuh

`57.` What were you doing at `7` o'clock yesterday?

`-`  I was reading book.

`58.` What was he doing when you came back?

`-` He was watching TV.

`59.` what were they doing when their mother returned home?
`-` They were playing games.

`60.` Did you buy this house in 1998?

`-` No. I bought it in `2001`

`57-> 60=>`Quá khứ tiếp diễn:

`+`$/$ S`+` was/were `+` V-ing 

`-`$/$ S + wasn't/ weren't `+` V-ing ?

`?`$/$  Was/Were `+` S `+` V-ing?

Wh `+` was/ were `+` S `+` V-ing?