Tam was working hard. Cam was sleeping(while)

$\Longrightarrow$   Tam was working hard while Cam was sleeping 

Giải đáp :

$\Longrightarrow$   While đứng ở giữa để Nối 2 mệnh đề. Cả hai hành động này đều diễn ra đồng thời trong Quá Khứ.

$\Longrightarrow$  S + was/ were + V_ing + WHILE + S + was/ were + V_ing

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$#Bear$

Ans:

`+` Tam was working hard while Cam was sleeping.

`+` While Tam was working hard, Cam was sleeping.

`-` Hai hành động cùng đồng thời song song tại cùng một thời điểm trong quá khứ.

`=>` Quá khứ tiếp diễn: S + was/were + Ving + O.

`-` S + was/were + Ving + O + while + S + was/were + Ving + O.