你知道该用“Can you…” 还是”Could you…“吗?

语法规则：

Can：通常指一个人有能力做某事。当使用can时，你很可能是指现在或将来时态中的这种能力，权力，技能。例如：I can go to the store after dinner.” ，即“I have the ability to go to the store after dinner.”

Could：它有多重含义。首先，could是can的过去形式。还有，could用来表达疑惑，怀疑或礼貌。如果有人问你：Can you do this for me?”，他只是想问我你是否可以做在这件事。而当有人问你“could you do this for me”他想问你是否愿意做，这更加的正式，礼貌，用来请求允许，或表达请求。

例句：

1.Excuse me, could you please show me how to do it?

2.When I was a little girl, I could dance like a robot without being afraid to be laughed at.



3.Can you sing an English song?



4.We can host as many as five children. (意思是我们有能力招待多达五个孩子。)

5.We could host as many as five children. (意思是我们有可能会招待多达五个孩子.)


练习:

选择 can 或 could 填空:

1. ________ you repeat your number again, please
2. ________ you play the piano
3. ________ you get some napkin for us, please
4. When I was a little, I _________dance, but now, I can’t any more.
5. I know you _______ do it.

参考答案:
 

1. Could
2. Can
3. Could
4. Could
5. Can