assure, make sure, insure的用法有什么异同,请帮忙比较下.

(使.确信),如果事物做主语,一般多用于过去式.
Invetigation assured us of the reliability of the plan.
(向.保证).
I can assure you of the availability of sources.
也可用于人寿保险.you are assured of the life insurance.
make sure:查实,确信,弄懂的意思.但和上述用法不一样.
在这里,make 是动词,sure 是其宾语.因此语句的组成要和其结构搭配.sure 后面多跟of 或者表语从句.
Please make sure (that) you leave on time.Make sure that you don't change mind.
Make sure of the time and place.
insure多用与保险.
My house/ car/ life has been insured.下面看这三个词同用在一句中: