我确信他会成功。

　　I'm not sure whether to go to the speech about traffic accident.

　　我不敢确信是否去听有关交通事故的报告。

　　[经典考题]Quite a few people used to believe that disaster _____if a mirror is broken.

　　（2002年上海）

　　A. was sure of striking B. was sure of having stuck.

　　 C. was sure to be struck D. was sure to strike

　　[点拨]答案为D 本题考查固定短语的搭配。be sure of doing表示主语对某事的自信把握，A、B与题意不符，C项语态不合题意。

　　 （2）diet此处作名词，意为"饮食；日常食物"。也可作动词，意为"节食；按规定进食"。

　　 [举例]We should have a healthy，balanced diet.

　　我们应该有健康和均衡的饮食。

　　I decided to go on a diet before my holiday.

　　我决定在休假前开始节食。

　　She's always dieting but she never seems to lose any weight.

　　她总是在节食，但体重好像并不减少。

　　7.But that's because I was stupid enough to play football in the rain.

　　但是那是因为我够蠢的，居然在雨中踢足球。

　　That was/is because 意思为"那就是因为......"，是由because引导的表语从句。

　　[举例]You have failed again this time. That's because you are proud.

　　你失败了，那就是因为你太骄傲了。

　　[辨析]That was/is because... 与 That was/is why...

　　前者表示原因，意思为"那就是因为......"；后者表示结果，意思为"那就是为什么......"。

　　[举例]Many is being punished by the headmaster. That was because she broke the school rule.

　　校长现在正惩罚着玛丽，那就是因为她违犯了学校的制度。

　　Tom is ill. That's why he hasn't come today.

汤姆病了，那就是为什么他今天没有来。