`1.` has

Giải thích: Thì HTHT

$\text{S + have/has + Ved/V3 + ...}$

`2.` had

Giải thích: thì QKHTTD

$\text{S + had been + V-ing + ...}$

`3.` was

Giải thích: thì QKTD

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

`4.` was

Giải thích: thì QKTD

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

`5.` is

Giải thích: thì HTTD

$\text{S + am/is/are + V-ing + ...}$

`6.` are

Giải thích: thì HTTD

$\text{S + am/is/are + V-ing + ...}$

`7.` be

Giải thích: thì TLTD

$\text{S + will be + V-ing + ...}$

`8.` do

Giải thích: thì HTĐ

$\text{Do/Does + S + V-bare + ...?}$

`9.` did

Giải thích: thì QKĐ

$\text{S + didn't + V-bare + ...}$

`10.` were

Giải thích: thì QKTD

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

`11.` been

Giải thích: thì TLHTTD

$\text{S + will + have + been + V-ing + ...}$

`12.` has

Giải thích: thì HTĐ

$\text{S + V-(s/es) + ...}$

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