① give in意为“屈服，让步”，可以单独使用，表示“向某人或某物让步”。结构为：

give in to sb.

give in to sth.

She would rather die than give in. 她宁死不屈。

I won't give in to her. 我决不迁就她。

They have given in our views.

（后面不可直接跟宾语）

They have given in to our views.

他们接受了我们的观点。

② give up意为“放弃，停止（做某事）”，结构为：

give up sth.

give sb./oneself up

give up doing sth.

She was forced to give up school. 她被迫辍学了。

He was so seriously wounded that the doctors gave him up. 他的伤那么重，医生放弃对他治疗了。

He has given up smoking. 他已经戒烟了。

③ give off意为“散发（光、热、气体、气味等）”。

The flowers gave off a sweet fragrance. 花儿散发出芳香。

The shoes give off a bad smell. 那些鞋子散发出难闻的气味。

④ give out意为“分发；宣布；耗尽”。

She gave the apples out to the children. 她把苹果分发给孩子们。

The supply of food gave out. 食物贮存告罄。

⑤ send out表示“发出，发送；长出（树叶等）”。

Have you sent out invitations？你把请柬发出了吗？

The trees send out new shoots in spring. 春天树长出了新芽。