Lesson 1 词汇辨析：
1. I'm not sure whether to go to the one about accidents. 我还没有决定是否去听那个有关事故的报告。
(1) be sure + whether等连词+不定式
be sure + of/about短语
be sure + that-clause（从句）
这些句型表示主语对所提到的未来或当时的事情有无把握。e．g。
① She isn't sure whether to stay in New York next month．下个月是否留在纽约，她还不能肯定。(注：不定式的逻辑主语与全句主语一致)
② I wasn't sure about/of the way，so I asked someone．我对于怎么走没有把握，所以我就问人了。
③I'm sure he'll come．我肯定他会来。
（2）be sure to do sth.表示"一定会...，必定会..."。e.g.
It's a really good film-you're sure to like it.它确实是一部好电影，你一定会喜欢
(3)be sure作"有把握"解时，还可用feel sure。e.g.
①I've never felt sure of success．我从来没有像现在这样对胜利有充分的信心。
②I feel sure we have disturbed you of your work．我确信我们已打扰了你的工作。
(4)be sure 与be certain
be certain意思是"确信，有把握"，用法与be sure同，即：
be certain + 不定式
be certain + of/about-phrase
be certain + that-clause
但sure强调主语的心理状态，指主语心中无疑或十分确信、有把握，着重于人的内心世界，故其主语只能是人，且不能用来形容事件。所以当主语是表示事件的名词、代词或it时，只能用certain. certain 着重说明有肯定的理由和证据使人相信或确信，强调内心世界之外的证据。e.g.
①it is certain to rain．天肯定会下雨。
②His information was by no means certain．他的消息-点也不可靠。
③ It's almost certain that the government will lose the next election．几乎可以肯定现政府会在下次选举中输掉。
④We are sure/certain of victory．我们确信自己会获胜。
(5)make sure表示"查明，弄确实"和"(采取行动)确保"，其用法是：
make sure + of-phrase
make sure + that-clause
① I think I locked the door，but I'll just go back and make sure of it/that I did．
我想我是锁了门，但我还是回去查看一下吧。
②They made sure of winning by scoring two goals in the last five minutes．
他们在最后五分钟进了两个球，确保了这场比赛的胜利。
2. Perhaps I'll go to that one。也许我会去听那个报告。
Maybe it was useful for some people．它(指报告)对一些人或许有益。
这两句都不表示可能性的句型。此外还有probably和possibly。注意它们的区别。
（1）maybe"大概，或许"，意思与perhaps很接近，多数地方可以换用，但不及perhaps正式，多用于口语，还可用于礼貌的建议或请求，多用于句首或句末，多用于美国。
(2)perhaps"也许，可能，大概"，可与maybe换用，但比maybe正式。perhaps还可用于建议，清求及温和的命令，英国用法。
(3)probably"大概，很可能"，所表示的可能性虽不是完全肯定，但比maybe，perhaps实现的可能性大多与动词连用。
（4）possibly"可能地，也许，或许"，较probably意味弱，在肯定句里表可能性很小，在否定、疑问句中与can，could连用，表示"无沦如何也不"，肯定句中与can，could连用，以加强语气，表示"设法，竭力地"。e.g.
①Perhaps/Maybe I'll go．我或许会去。
②This is perhaps his best novel yet．这也许是他迄今为止写得最好的一部小说。
③Perhaps/Maybe you would like to join us for lunch．也许您愿意和我们一块去吃午饭。（表请求）
④You'd better go now，perhaps．您最好还是现在就走。（表命令）
⑤John probably told his father all about the matter；he usually tells him everything．约翰很可能把这一切都告诉了他的父亲；他通常对父亲是什么都说的。(表可能性很大)
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