Do you know John? 你认识约翰吗?
Mary didnt come to see me yesterday. 玛丽昨天没来看我。
You like this picture, dont you? 你喜欢这张画,不是吗?
2、代替前面已经提到过的动词,避免重复:
Do you smoke? ?Yes, I do. 你抽烟吗?-是的,我抽。
I smoke. So does he. 我抽烟。他也抽。
He doesnt like it. Neither do I. 他不喜欢,我也不。
They went swimming yesterday. So did we. 他们昨天去游泳了。我们也去了。
3、帮助加强谓语动词的语气:
I do like you. 我真的喜欢你。
She/He does like you. 她/他确实喜欢你。
She/They/We did go swimming yesterday. 她/他们/我们昨天确实去游泳了。
If you do know, answer me in a loud voice so that all may hear. 如果你的确知道,就大声回答我,以便大家都能听见。
be, have, do 都能做实意动词用:
These are computers. 这些是计算机。
Were having breakfast. 我们正在吃早饭。
I did some washing last night. 我昨晚洗了衣服。
(四)助动词shall和will的用法
1、助动词shall/will构成一般将来时;should/would构成过去将来时
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