在英语句型be sure这个结构中，sure是形容词，含义为“确定的，确信的，有把握的，肯定的”。句型be sure后面可以跟的成分有以下几种，具体内容如下：
1、be sure后面跟介词about
例句：Are you sure about his feeling for Mary?
译文：你可以确定他对玛丽的感情吗？
例句：---What do you think of Mike?
---I'm not quite sure about him.
译文：---你认为迈克怎么样？
---我对他不怎么信得过。
2、be sure后面跟介词of
例句：I'm sure of one thing: he can finish the work on time.
译文：我确信一件事：他能按时完成工作。
例句：Are you sure of winning the next match?
译文：你有把握赢得下一场比赛吗？
3、be sure 后面跟动词不定式to do sth
例句：They are sure to go on a trip to the Great Wall next month.
译文：他们肯定下个月去长城旅行。
例句：Be sure to turn off the lights when you leave the house.
译文：你离开家时务必要关灯。
4、be sure 后面跟that从句
例句：Are you sure (that) he will go to the park with Mike this weekend?
译文：你确信这个周末他会和迈克一起去公园吗？
例句：Mary is sure that she will succeed in the end.
译文：玛丽确信她最后一定会成功。
5、be sure 后面跟if/whether从句
例句：I'm not sure if she is going to visit us.
译文：我拿不准她是否打算来拜访我们。
例句：She's not sure whether she will give you a hand or not.
译文：她拿不准要不要助你一臂之力。
6、be sure 后面跟wh-从句
例句：I'm not sure who will attend the meeting.
译文：我不确定谁会参加会议。
例句：Mike isn't sure when she will go to the movies next week.
译文：迈克不确定她下周什么时候去看电影。
这就是be sure后面可以跟的六种成分，希望大家一定要记住。
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