1. As it's foggy, we can't drive in the North.

(Because/As/Since (bởi vì)+clause 1, clause 2....)

2. Although Lan's brother was ill, he finished the exercises.

(Although + clause 1, clause 2..... = Clause 1, but + clause 2....)

4. She swims skillfully. 

(S+(be)+(a/an)+adj+N ⇔ S+V+adv)

8. I suggest making potters on saving energy and hanging them on the gate.

(Let's +V.... = I suggest + V-ing ....)

Đáp án:

 1. As it's foggy, we can't drive to th North

 2. Althought Lan's brother was ill, he finished the exercises.

 4. She swims skifully

 8. I suggest making posters on saving energy and hanging them on the gate.

          (suggest + Ving)