Đáp án:
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II. IF- CLAUSE
1. You had trouble at school because you didn’t do your homework.(using IF)
$\text{→ If you had done your homework, you wouldn't have had trouble at school}$
2. Mel doesn’t ask her teacher so he doesn’t answer her questions. (inversion of IF_clause)
$\text{→If Mel asked her teacher, he would answer her questions}$
3. they do not listen carefully so they can’t hear the woodpecker. (inversion of IF_clause)
$\text{→If they listened carefully, they could hear the woodpecker}$
4. If I had lain down on the sofa, I would have fallen asleep. (inversion of IF_clause)
$\text{→Unless I had lain down on the sofa, I would not have fallen asleep}$
5. If you gave the young boy this stick, he’d hurt himself. (inversion of IF_clause)
$\text{→Unless you gave the young boy this stick, he’d not hurt himself}$
6. The students didn’t solve the problem because they didn’t use their textbooks. (using IF)
$\text{→If the students had used their textbooks, they would have solved the problem}$
7. He doesn’t wash his feet more often so his girlfriend doesn’t visit him more often. (inversion of IF_clause)
$\text{→If he washed his feet more often, his girlfriend would visit him more often}$