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make sure,ensure,assure的区别

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make sure,ensure,assure的区别
说明它们的不同、用法、固定搭配,最好有例句.
意思都不一样.
make sure
1.查明;设法确保,确定
You must make sure of the time and place.
你必须把时间和地点弄清楚.
ensure
1.保证;担保[O9][+that][+v-ing]
I can't ensure his being on time.
我不能保证他的准时.
I can't ensure that he will be there on time.
我不能担保他会及时到那儿.
This medicine will ensure you a good night's sleep.
这药将保证你一晚睡眠良好.
2.使安全,保护[Q][(+from/against)]
These are safety devices to ensure workers against accidents.
这些安全设施是为了保护工人不出事故.
assure
1.向...保证,担保[(+of)]
I can assure you of the reliability of the information.
我向你保证这消息可靠.
The captain of the ship assured the passengers that there was no danger.
船长向乘客保证没有危险.
2.使确信,使放心[(+of)]
We assured our clients of an enjoyable holiday.
我们使游客确信准能过一个愉快的假期.
3.(后接oneself)使弄清楚,使确定
They assured themselves that the bridge was safe before crossing it.
他们直到弄清楚那座桥确实安全后才通过.
4.确保,保障
Her future was assured.
她的未来是有保障的.
5.保证给予