1 The weather was so terrible that they couldn't get to work. ( câu này có nhiều cách viết : S + be + so + adj + that + S + V )

2 He has studied English for 10 years. ( S + have/has + Vpp )

3 The room hasn't been tidied. ( câu bị động hiện tại hoàn thành: S + have/has + been + Vpp )

4 If people didn't pollute the environment, we wouldn't be in danger. ( If 2: If + S1 + V2/ed, S2 + would + Vinf )

5 I wish I knew how to use a computer. ( câu mong ước nên lùi thì )

$1$ $The$ $weather$ $was$ $so$ $terrible$ $that$ $they$ $couldn't$ $get$ $to$ $work.$
$2$ $He$ $has$ $studied$ $English$ $for$ $10$ $years.$
$3$ $The$ $room$ $hasn't$ $been$ $tidied.$
$4$ $If$ $people$ $didn't$ $pollute$ $the$ $environment,$ $we$ $wouldn't$ $be$ $in$ $danger.$
$5$ $I$ $wish$ $I$ $knew$ $how$ $to$ $use$ $a$ $computer.$