文档介绍：
初 中 英 语 语 法 知 识 讲 解
非 谓 语 动 词 的 用 法
非谓语动词：英语句子中的动词有时并不作谓语使用，而是用作句子的其它成分（如主语、宾语、补语、ften hear her sing English songs in the next room.
The boss made them work over 12 hours a day.
She often helps her mother (to) do the housework.
4、两个不定式由and , or , except , but 或 than连接在一起时，第二个不定式常常不带to。
I’d like to lie down and have a good rest.
三、-ing分词还是不定式：
1、动词like之后，使用不定式主要说明一次性的动作；使用-ing分词主要说明存在的状况。
I like playing soccer, but I don’t like to play it this afternoon.
2、begin和start之后，-ing分词和不定式都可使用，但如果begin/start自身为-ing分词时，之后通常用不定式。
He began to do/doing his homework after dinner.
I’m starting to cook dinner very soon.
3、stop、remember、forget和go on之后的非谓语动词形式的判定，主要应考虑非谓语动词的动作在谓语动词动作前是否已发生：如动作发生在谓语动词的动作前，用-ing形式；如动作发生在谓语动词的动作后，用不定式。
The teacher is coming, please stop talking.
On her way home, she stopped to buy some food for supper.
Don’t forget to turn off the light when you leave.
He did his homework again. He forgot doing it yesterday.
4、need之后的非谓语动词形式的判定，主要考虑句子的主语同非谓语动词的关系：如句子的主语为非谓语动词的逻辑主语，用不定式；如句子的主语为非谓语动词的逻辑宾语，用-ing形式。
We need to water the flowers this afternoon.
The flowers need watering this afternoon.
5. 感官动词后的非谓语动词形式的判定，主要应考虑是说明整个动作（不带to的不定式），还是说明动作的一部分（-ing形式）。主要有下面几种情况：
（1）句子中有表频率的词时，用不带to的不定式；
I often hear Lucy sing songs in the classroom.
（2）look a