I.
1,David had gone home before we arrived
-->After David came home, we arrive
2.We had lunch then we took a look around the shops
-->Before tooking around the store we had lunch
3.The light had gone out before we got out of the office
--> When we were not out of the office, the light was gone

II. Correct the verb form of the sentences
1.When I (come)......came...........there,they(leave)......left.......
2.When I (get up)....woke up..............this morning,my father (leave)....left...........
3.After the children (finish).........finish...........their homework ,they(go)...will go.......to bed
4.I(do).......did.......it before he(come)........came...........
5.I (meet)......meet..........them after they(divorce).....divorce........each other
6.If I (not buy)......don't buy..........this dress,I (have)....will have......money
cho mình 5 sao nhé

III. Change the following sentences into passive voice
1.They can't make tea with cold water
-->Tea can not be mixed with cold water
2.The chief engineer was instructing all the workers of the plant
-->All accreditation of the plant was guided by the chief engineer
3.Somebody has taken some of my books away
-->Some of my books have been taken away by somebody
4.They will hold the meeting before May Day
-->The meeting will be held before May by them