Sắp xếp 1. are waiting / outside the door / their children / them for. 2. Which / after / "I" / ? / letter / come 3. hold / a day / yesterday / Nam's school / sports.

`1.` Their children are waiting for them outside the door.

`->` thì HTTD:

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

`2.` Which letter come after '' I ''?

`->` $\text{Which + N + S + V?}$

`3.` Nam's school hold a sport days yesterday.

`->` yesterday `->` thì QKĐ

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

$chucbanhoctot$

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