one和it用法的区别

one是不定代词，只表示数量为一的单数名词，而没有限定，而代词it表示有限定意义的名词。另外，one可以加修饰语，而it不可以，如：

I'd like to borrow a hammer if you have one.

Did you bring the textbook?

No, I didn't bring it.

I lost my mobile hard disk yesterday, so I have to buy a new one.

These boots have worn out. I have to buy some new ones.

I like that picture--I mean the third one from the left.

The guitar is similar to the one that I have.

希望我能帮助你解疑释惑。

一周一次once a Week，一周两次twice a week，一周三次three times a week。

week

英［wi?k]美［wi?k]

n.周；星期；礼拜；一周；七天的时间；（除星期六和星期日以外的）五天。

［例句］The new rules come into operation from next?week.

新规定从下周起实施。

［其他］复数：weeks。

词语用法

week的意思是“星期”，可指星期日到星期六的七天，也可指从任何时候算起的连续七天，还可指包括某一特定的一周，举行某种庆祝之周等。

“两星期”的表示方法英式英语用fortnight,而美式英语用two weeks。

Monday〔Tuesday〕week指从本星期一〔星期二〕算起的前一个或后一个星期一〔星期二〕。

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