1.

The water was so rough that the children couldn't go swimming.

It was such the rough water that the children couldn't go swimming.

2. 

Jane said to us she didn't know how to solve that mathematical problem.

3. 

If you finish your work, you can come back.

4. 
If I hadn't spoken English so poorly at the interview, they would have hired me.
5. 
I don't understand Maths faster than Peter
I understand Maths slower than Peter ( nên làm cách này :v)

6. If I hadn't gone to bed late, I wouldn't be tired today.

1. The water was so rough that the children couldn't go swimming.

It was such rough water that the children couldn't go swimming.

2. Jane told us that we didn't know how to solve that mathematical problem.

3. If you don't finish your work, you can't come back.

4. If I didn't speak English so poorly at the interview, they would hire me.

5. I can't understand maths as fast as Peter.

6. If I didn't go to bed late last night, I wouldn't be so tired.

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Xin hay nhấtt!!