Đáp án + Giải thích các bước giải:

 Các câu đều dùng đại từ sở hữu và tính từ sở hữu:

2. These are the girls' hats.

They're their hats.

These hats are theirs.

3. These are the boys' bikes.

They're their bikes.

These bikes are theirs.

`2.` These are the girls' hats.

They're their hats.

These hats are theirs.

`3.` These are the boys' bikes.

They're their bikes.

These bikes are theirs.

$\text{These/ Those + are + N số nhiều}$

$\text{This/That + is + N số ít}$

$\text{ĐTSH = TTSH + N}$

@Càng