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worth, worthy, worthwhile用法区别一:
worth表示“值,值得”,可用表语或后置定语,其后一定要有名词或动名词作宾语,但不能接不定式。如:
The book is worth $ 100.这本书值100元。
The book is worth reading.这本书值得看。
This is a book worth reading.这是一本值得读的书。
worth, worthy, worthwhile用法区别二:
worthy表示“应得,配得上,值得”,常作表语或后置定语,后接不定式,或of加名词或动名词。如:
His behaviour is worthy of great praise. 他的行为应受到高度赞扬。
I think he is not worthy of her. 我认为他配不上她。
The book is worthy of being read. = The book is worthy to be read.这体书值得读。
This is a book worthy of being read. = This is a book worthy to be read.这是一本值得读的书。
worth, worthy, worthwhile用法区别三:
一、两者在用法上的相同点
两者都可用作表语,表示“一定”或“确信”,有时可互换。互换的场合应注意以下几点用法:
1. 表示说话者的态度或看法
即表示说话者自己的态度或看法,其意为“一定会”“肯定会”。此时主要用法有:
(1) 单独用作表语。如:
One thing was sure [certain]: they'd be late. 有一件事是确定无疑的,他们会迟到。
(2) 后接不定式。如:
He's certain [sure] to win. 他一定会成功。
They're certain [sure] to need help. 他们肯定需要帮助。
If you do this, you are certain [sure] to be found out. 如果你这样做一定会被发现。
2. 表示句子主语的判断或信念
即表示句子主语对某一情况的判断或信念,其意为“相信”“确信”“有把握”等。此时通常用于以下结构:
(1) 后接of [about] sth。如:
He is certain [sure] of success. 他确信会成功。
Are you certain of [about] that? 你对此有把握吗?
(2) 后接 of doing sth。如:

Our team is certain [sure] of winning. 我们队有把握赢。
You can be sure [certain] of his agreeing. 你可以放心他会同意。
比较同义句:
He is certain [sure] of winning.
=He is sure [certain] that he will win. 他自信会赢。
(3) 后接 that / whether / if 从句。如:
I am sure [certain] that he is honest. 我肯定他是诚实的。
I'm sure [certain] that it's not your fault. 我敢肯定这不是你的错。
Are you certain [sure] that this is the right road? 你肯定这条路对吗?
注:当be sure [certain]为肯定式或疑问式时,后接that从句;当be sure [certain]为否定式时,后接whether [if]从句。如:
I'm not sure [certain] whether he still works there. 我不能肯定他是否还在那里工作。
I wasn't sure [certain] whether he would agree. 我不太肯定他是否会同意。
He wasn't sure [certain] whether he would be able to get back in time. 他不能肯定他是否能准时回来。
(4) 后接其他从句。如:
I'm not sure [certain] where she lives. 我不能肯定她住在哪里。
I'm not certain [sure] who wrote it. 我不太清楚这是谁写的。
二、只能用certain的情形
以下情况通常只用certain,而不用sure:
1. 当句中用了形式主语或形式宾语 it 时。如:
It's certain that he'll come tomorrow. 他明天肯定会来。
I thought it certain that he would be late. 我肯定他会迟到。
It's certain that prices will go up. 价格肯定会上涨。
It's not certain how much it will cost. 这要花多少钱还不确定。
2. 当表示“某一”“某些”时。如:
A certain Mr Green wants to see you. 有个叫格林先生的人想见你。
Certain plants are good to eat but others are not. 有些植物好吃, 而其他一些则不好吃。
worthwhile表示“值得的,值得干的,值得花时间/金钱/精力的”,可作定语、表语或宾补。如:
Nursing is a very worthwhile career. 护理是很值得干的职业。(定语)
The visit to Paris is worthwhile. 去巴黎访问是值得的。(表语)
I think it worthwhile to read the book. 我认为看那本书是值得的。(宾补)
还可用于It is worthwhile doing /to do sth. 句型。如:
It is worthwhile reading /to read the book.= Reading /To read is worthwhile.这本书值得看。
有时可在worth与while之间插入one's。如:
The work is worth your while. 这工作值得你去做。
It is worth our while to discuss the question. 这个问题值得我们讨论。
Make it worth sb.'s while 酬谢某人。如:
They promised to make it worth her while if she would take part. 他们许诺说她要是参加,就给她报酬。
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