Giúp mình với các bạn

`15`.was playing / was playing

`->` While + S + was / were + V-ing , S + was / were + V-ing

`=>` Dùng để diễn tả `2` hành động đang xảy ra cùng `1` lúc

`16`.have taught

`->` Thì HTHT : S + have / has + VpII

`=>` I , You , We , They `+` have

`->` `DHNB` : several times

`17`.had gone

`->` Thì QKHT : S + had + VpII

`->` By + time + S + had + VpII

`=>` Dùng để diễn tả hành động đã xảy ra vào thời điểm cụ thể

`18`.didn't do

`->` Thì QKĐ ( PĐ ) : S + didn't + V

`->` `DHNB` : yesterday

`19`.doesn't wear

`->` Thì HTĐ ( PĐ ) : S + don't / doesn't + V

`=>` He , She , It `+` doesn't

`->` `DHNB` : every

`\text{# TF}`