问题描述：
用英文解释下列句子
1.Three teenagers decided to do volunteer work.
2.He hopes that he can do it himself.
3.The mother told me:“Don’t be late.”
4.We felt sad when we listened to her.
1.Three teenagers decided to do volunteer work.
2.He hopes that he can do it himself.
3.The mother told me:“Don’t be late.”
4.We felt sad when we listened to her.
问题解答：
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