Ⅰ. be sure指某人對(duì)某事或?qū)δ撤N情況有把握,常譯為:“確信”;
make sure 指“務(wù)必、務(wù)請(qǐng)、確保”將某事弄清楚。如:
① I am sure that he is honest.我相信他是誠(chéng)實(shí)的。
② I have made sure that he is honest.我已了解清楚他是誠(chéng)實(shí)的。
Ⅱ. 二者后面均可接of 或about 引出的短語(yǔ)。如:
① I am sure of success
= I am sure that I will succeed.我深信會(huì)成功。
② Will you make sure of his return?
= Will you make sure that he returned?請(qǐng)你查明他是否真的回來(lái)了。好嗎?

Ⅲ. make sure 后面的that 從句一般不用或很少用將來(lái)時(shí);
be sure 后面的that從句則可用將來(lái)時(shí)。如:
① Make sure that you come here beforefive. 你一定要在5點(diǎn)前來(lái)。
② I am sure that he will come.我相信他一定會(huì)來(lái)的。
Ⅳ. 兩者后面接不定式,均表示“一定要做某事”,但make sure通常只用于祈使句;
而be sure 則不受限制。如:
① Make sure to come to party on time.一定要準(zhǔn)時(shí)來(lái)參加晚會(huì)。
② He is sure to call you up.他準(zhǔn)會(huì)給你打電話的。
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