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非谓语动词包括不定式、现在分词、动名词、过去分词等。现在举例来分别说明如何确定英语句中的非谓语动词的形式。
一、非谓语动词作主语
当动词作主语时，可以用动名词或动词不定式，但不能用动词原形。不定式作主语有时常放在句尾，但句首要用it 作形式主语，代替它。例如：“跑”这个动词在句子中可以译成： Running every day is good for our health . To run every day is good for our health. 或It’s good for our health to run every day . 解释：在is 前是主语时，可用Running 或 To run 。 例如，1. Eating Dangshen herbs is good. 2. Knowing how to ask for information politely is important. 3. It takes an hour to go to Jilin by bus. 4. To touch it is very dangerous. =It is very dangerous to touch it.
二、非谓语动词作宾语
1. 在下列动词后的动词一般都用不定式 。
例如：want hope need try plan allow decide learn teach seem afford refuse continue offer pretend promise be sure 例如：You can’t wake a person who is pretending to be asleep. I hope to succeed this time. She wants to join the club. The man taught us how to repair the tools. 注意：当need 前的主语是物时，need 后只能用动名词。例如：The flowers need watering .
2. 在下列动词后的，有时用动词不定式 ，有时用动名词。
love prefer like hate forget remember start begin continue regret stop go on 上面这些动词后用不定式和用动名词的句意差不多。用不定式侧重动作。而用动名词侧重于事。注意： stop 后用不定式和用动名词的句意相反。Stop dong 表示停止做 ，stop to do 表示停下来开始做--（另一件事） 。 go on doing 表示继续做同一件事 ，go on to do 表示接着做另一件事。 例如： I remember seeing her once somewhere. I must remember to take my keys with me. He went on working after a while.
3. 在下列动词suggest finish keep mind put off practice avoid enjoy后的， 只用动名词。 can’t help-- ， be worth -- ，give up-- 后用动名词。
例如： I have finished reading the novel. Do you mind my opening the door？ I can’t help laughing. The idea is well worth considering.
4. 在介词后或含有介词的动词词组后，都用动名词。并作介词的宾语。
①. He left his home without having breakfast. ②. What about going out for a walk？ ③. I am good at swimming. ④. Thank you for giving me so much money.
5. 在下面的句型中用不定式。
1） 前有形容词作宾补足语时，用不定式短语作宾语，句中的 it为形式宾语。. They found it impossible to get everything ready in time. Do you consider it better not to go ？ She thought it unnecessary to argue with him about it.
2） 前有疑问词时，用不定式。
Do you know how to express the idea in English？
三、非谓语动词作表语时，可用不定式，也可用动名词
1. Her wish is to become a nurse in the future. 2. My hobby is collecting old coins. 3.The question is how to deal with the suggestions. 注意： 前有疑问词时只能用不定式。
四、非谓语动词作定语
现在分词作定语时，一般放在名词前，现在分词短语作定语时放在名词后。不定式作定语放在名词后。过去分词作定语放在名词前，过去分词短语作定语时应放在名词后。 例如：1. This is a swimming pool. 2. She has an important meeting to attend now. 3. Please make a sentence with the given words. 注意： 用现在分词作定语有主动的意思，而用过去分词表示被修饰的名词有被动的意思。
总之，教师要善于总结归纳课文中的词组或句型。只有让学生在大量的练习和使用中，他们才能把握非谓语动词句中的使用规律。
一、非谓语动词作主语
当动词作主语时，可以用动名词或动词不定式，但不能用动词原形。不定式作主语有时常放在句尾，但句首要用it 作形式主语，代替它。例如：“跑”这个动词在句子中可以译成： Running every day is good for our health . To run every day is good for our health. 或It’s good for our health to run every day . 解释：在is 前是主语时，可用Running 或 To run 。 例如，1. Eating Dangshen herbs is good. 2. Knowing how to ask for information politely is important. 3. It takes an hour to go to Jilin by bus. 4. To touch it is very dangerous. =It is very dangerous to touch it.
二、非谓语动词作宾语
1. 在下列动词后的动词一般都用不定式 。
例如：want hope need try plan allow decide learn teach seem afford refuse continue offer pretend promise be sure 例如：You can’t wake a person who is pretending to be asleep. I hope to succeed this time. She wants to join the club. The man taught us how to repair the tools. 注意：当need 前的主语是物时，need 后只能用动名词。例如：The flowers need watering .
2. 在下列动词后的，有时用动词不定式 ，有时用动名词。
love prefer like hate forget remember start begin continue regret stop go on 上面这些动词后用不定式和用动名词的句意差不多。用不定式侧重动作。而用动名词侧重于事。注意： stop 后用不定式和用动名词的句意相反。Stop dong 表示停止做 ，stop to do 表示停下来开始做--（另一件事） 。 go on doing 表示继续做同一件事 ，go on to do 表示接着做另一件事。 例如： I remember seeing her once somewhere. I must remember to take my keys with me. He went on working after a while.
3. 在下列动词suggest finish keep mind put off practice avoid enjoy后的， 只用动名词。 can’t help-- ， be worth -- ，give up-- 后用动名词。
例如： I have finished reading the novel. Do you mind my opening the door？ I can’t help laughing. The idea is well worth considering.
4. 在介词后或含有介词的动词词组后，都用动名词。并作介词的宾语。
①. He left his home without having breakfast. ②. What about going out for a walk？ ③. I am good at swimming. ④. Thank you for giving me so much money.
5. 在下面的句型中用不定式。
1） 前有形容词作宾补足语时，用不定式短语作宾语，句中的 it为形式宾语。. They found it impossible to get everything ready in time. Do you consider it better not to go ？ She thought it unnecessary to argue with him about it.
2） 前有疑问词时，用不定式。
Do you know how to express the idea in English？
三、非谓语动词作表语时，可用不定式，也可用动名词
1. Her wish is to become a nurse in the future. 2. My hobby is collecting old coins. 3.The question is how to deal with the suggestions. 注意： 前有疑问词时只能用不定式。
四、非谓语动词作定语
现在分词作定语时，一般放在名词前，现在分词短语作定语时放在名词后。不定式作定语放在名词后。过去分词作定语放在名词前，过去分词短语作定语时应放在名词后。 例如：1. This is a swimming pool. 2. She has an important meeting to attend now. 3. Please make a sentence with the given words. 注意： 用现在分词作定语有主动的意思，而用过去分词表示被修饰的名词有被动的意思。
总之，教师要善于总结归纳课文中的词组或句型。只有让学生在大量的练习和使用中，他们才能把握非谓语动词句中的使用规律。