1.如果前面一个句子有连词的话,动词一般用动词原形;
如:If she comes again,tell her that I am not at home.
2.如果前面一个句子没有连词的话,并且前面没有-ing分词或-ed分词的话,动词一般用-ing形式或动词不定式。
如:He stood there ,singing.(表示伴随)
He hurried to the station,only to find that the train had left.(意外的结果)
3.如果前面有-ing形式或-ed分词的话,动词要用动词原形。
如:Answering questions,speak aloud ,please.
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