▲make sure意为 “务必” “确信” “确保”“弄清楚”，后接of/about sth. 或that引导的宾语从句，不定式（少用）“一定”。如：

（1）Have you made sure of the time of the train?

火车开车的时间你搞清楚了吗？

(2)He arrived at the cinema early to make sure of a seat.

为保证搞到座位，他一大早就到了电影院。

(3)I only come to make sure that everything was all right.

我只是来弄清楚是否一切都没有问题。

(4)We made sure you were not coming today.

我们确信你今天不来了。

【注】请注意make sure, be sure, for sure的区别：

be sure后接不定式时，意为“一定”“必定”， 主语可以是人，也可以是物， 表示说话人推测；若跟of或about或从句，作“肯定”“有把握”解释，主语是人， 主语感到"有把握；确信"；to be sure作插入语时，意为“的确”“诚然”。如：

He is sure of his success. /He is sure that he will succeed. 他确信他会成功。

He is sure to succeed. 他一定会成功。（说话人的看法）

（5）Be sure to write and tell me all the news.

一定要写信告诉我所有的消息。

(6)She is sure to find out the truth tonight.

她今晚一定会把真相搞清楚。

(7)She is not pretty, to be sure, but she is very clever.

她的确不漂亮，但是她很聪明。

(8)I’m not quite sure of his telephone number.

我不大清楚他的电话号码。

▲for sure 意为“肯定地”“毫无疑问地”。如：

(9)I don’t know it for sure.

这事我不敢肯定。

(10)I don’t know for sure that he was dead.

我确实不知道他已经去世了。