Cứu mình với đi mà:)

`Ex1:`

`1.` were building

`2.` was driving

`3.` wasn't doing

`4.` was watching

`5.` was preparing

`6.` were you doing

`7.` were you going

`8.` weren't going

`Ex2:`

`1.` saw

`2.` were you doing

`3.` didn't visit

`4.` rained

`5.` went

`6.` ate

`7.` were running

`8.` Did you find

`9.` was she dancing

`10.` were watching

`Ex3:`

`1.` play `->` playing 

`2.` study `->` studying

`3.` do `->` doing

`4.` went `->` go

`5.` weren't `->` didn't

`6.` have `->` had

`7.` broke `->` break

`8.` go `->` went

`9.` am `->` were

`10.` went `->` go

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$\text{*Structure: Past Simple:}$ (thì Quá khứ đơn)

`-` Đối với đt thường:

$\text{(+) S + Ved/V2 + ...}$

$\text{(-) S + did not + -bare + ...}$

$\text{(?) Did + S + V-bare + ...?}$

`-` Đối với đt tobe

$\text{+) S + was/were + ...}$

$\text{(-) S + was/were not + ...}$

$\text{(?) Was/were + + ...?}$

`-` `DHNB:` yesterday, ago, last night, last Sunday/Monday/Tuesday/...

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$\text{*Structure: Past Continuous: }$ (thì quá khứ tiếp diễn)

$\text{(+) S + was/were + V-ing + ...}$

$\text{(-) S + was/were not + V-ing + ...}$

$\text{(?) Was/Were + S + V-ing + ...?}$

`DHNB:` at `+` giờ `+` thời gian trong quá khứ, at this time `+` time in the past, in `+` năm,...

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

`-` When + S + was/were + V-ing, S + Ved/V2

`-` When + S + Ved/V2, S + was/were + V-ing