在英语语法中什么时候动词用原形？

1 情态动词后

I must go to bed.

Can you swim?

2 一般现在时

I go to school by bike every day.

3 一般过去时否定句，疑问句

I didn't go to school yesterday.

Did you go to school yesterday?

4 一般将来时

I will go to Shanghai next week

5 祈使句

Run quickly! Run!

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