=>

I/

1. are -> were

-> last holiday (QKĐ, dùng was/were)

2. don't -> didn't

-> last summer vacation (QKĐ, S didn't V)

III/

1. am eating

-> now (HTTD, S is/am/are Ving)

2. went

-> last month (QKĐ, S V2/ed)

3. Will you go

-> next month (TLĐ, Will S V?)

4. did you do

-> yesterday (QKĐ, Did S V?)

`1.` are `->` were

`-` Quá khứ đơn - last holiday

`(+)` (Wh-q) + was/were + S + ...?

`-` I/ she/ he/ it và N số ít - was

`-` You/we/they  và N số nhiều - were

`2.` don't `->` didn't

`-` Quá khứ đơn - last summer vacation: `(-)` S + didn't +V 

`III`

`1.` am eating

`-` Hiện tại tiếp diễn - now:

`(+)` S + is/am/are + Ving

`-` She/ he/ it và N số ít - is 

`-` I - am

`-` You/we/they và N số nhiều - are

`2.` went

`-` Quá khứ đơn: last month: `(+)` S + Ved/ V2

`-` go `-` went `-` gone

`3.` Will .. go?

`-` Tương lai đơn - next month: `(+)` Will + S + V?

`4.` did ... do?

`-` Quá khứ đơn - yesterday: `(?)` Did + S + V?