IV. Build sentences using the words given. 1. (we / used / wear / uniforms / when / we / be / schoolchildren.) 2. (he / work / the computer / last night?) 3. (Liens parents / wait / her / when / she / get off / plane / this afternoon.) 4. (last summer / we / visit / Ha Long Bay / Cat Ba Island.) 5. (I / was not / hungry / because / I / already eat / big lunch.)

`IV.`

`1.` We used to wear uniforms when we were school children.

`->` used to `+` V-bare: chỉ thói quen/tình trạng trong qk

`2.` Did he work on the cumputer last night?

`->` on `+` mặt phẳng

`3.` Lien's parents will wait for her when she gets off the plane this afternoon.

`->` S + will + V-bare + when + S + V-(s/es)

`->` wait for sb: đợi ai đó

`4.` Last summer, we visited Ha Long Bay and Cat Ba Island.

`->` visit `+` place: đi đến thăm địa điểm nào đó

`5.` I was not hungry because I had already eaten a big lunch.

`->` hành động xảy ra trước hành động khác trong quá khứ `->` thì QKHT

`-` Hành động xảy ra trước `->` thì QKHT: `(+)` S + had + P2

`-` hành động xảy ra sau `->` thì QKĐ

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

$\text{*Structure: Past Simple:}$ (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/...