I. Find anh correct the mistake in each sentences 1.they traveling to shool by bus -> 2.where is she going at five on the morning? -> 3.My classroom isn't big.It's on the two floor -> giải hộ em

1.They traveling to shool by bus 

$\rightarrow$ They are traveling to school by bus.

Công thức :

S + be verb + V-ing + preposition + noun

2.Where is she going at five on the morning?

$\rightarrow$Where is she going at five in the morning?

Công thức:

Wh-question word + be verb + subject + main verb + preposition + time expression

3.My classroom isn't big.It's on the two floor.

$\rightarrow$ My classroom isn't big. It's on the second floor.

Công thức : 

Subject + be verb + negation + adjective/noun + preposition + location

`1` travelling `->` travel

`-` HTĐ: S + V(-s/es)

`2` on `->` in

`-` in the + buổi trong ngày

`3` two `->` second

`-` on the + số thứ tự + floor: ở tầng mấy