1. '' Don't forget to do your assignment, Jack.'' said Jack's mother.

=> Jack's mother told him not to forget to do his assignment.

2. I suggest you take part in the competition.

=> If i was you, I would take part in the competition.

3. It was so late that they couldn't do anything without this.

=> It was so late for them to do anything without this.

4. Although i can't speak Chinese, i decide to settle in Shanghai.

=> In spite of the fact that i can't speak Chinese, i decide to settle in Shanghai.

5. It is difficult for me to understand his dialect.

=> I find it difficult to understand his dialect.

1.Jack's mother told him to not forget his assignment.
2.If i were you, I would take part in the competition
3. It was too late for them to do anything about this.
4.In spite of not being able to speak Chinese, I decide to settle in Shanghai
5.I find it difficult to understand his dialect