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be sure/ make sure Ⅰ. be sure 指某人对某事或对某种情况有把握，常译为：确信；make sure 指务必、务请、确保将某事弄清楚。如： ① I am sure that he is honest. 我相信他是诚实的。 ② I have made sure that he is honest. 我已了解清楚他是诚实的。 Ⅱ. 二者后面均可接of 或about 引出的短语。如： ① I am sure of success = I am sure that I will succeed. 我深信会成功。 ② Will you make sure of his return? = Will you make sure that he returned? 请你查明他是否真的回来了。好吗？ Ⅲ. make sure 后面的that 从句一般不用或很少用将来时； be sure 后面的that从句则可用将来时。如： ① Make sure that you come here before five. 你一定要在5点前来。 ② I am sure that he will come. 我相信他一定会来的。 Ⅳ. 两者后面接不定式，均表示一定要做某事，但make sure 通常只用于祈使句；而be sure 则不受限制。如： ① to come to party on time. 一定要准时来参加晚会。 ② He is sure to call you up. 他准会给你打电话的。 | 
