assure ensure insure

assure:1.to tell someone that something is certainly true,in order to make them feel more confident.(向人作保证)
example:i assure you that this medicine can not harm you.
i can assure you of his good intentions.
2.to make someone feel certian of having somthing(叫人放心那事定发生)
example:our clients are assured of a trouble-fee holiday.
we can assure you a carefree retirement.
enture:to make something certain to happen(使某事定发生)
if you want to ensure that you catch the plane,take a taxi to the airport.
we need to change the law to ensure fair treatment for all people.
insure :1 to prtect someone or something from the costs of damage,loss ,or an accident by making an agreement with a company that will pay those costs(保险)
exaple:my house is insured against fire.
are you insured?(你保了人寿险了吗?)
2 the usual American word for = ENSURE (美语中等于ensure)