1. dependant，只能做名词：靠……养活的人或家眷; 受扶养者(尤指孩子);靠他人生活者：
The British Legion raises funds to help ex-service personnel and their dependants.
英国退伍军人协会筹集款项帮助退役人员和他们的家属。
I am little better than a dependant.
我比寄人篱下的人好不了多少。
A man’s wife and his children are his dependants.
男人的妻子和孩子是靠他扶养的人。
2. dependent
名词：靠……养活的人或家眷; 受扶养者(尤指孩子);靠他人生活者
形容词：依靠的;依赖的;有瘾的;受…的影响;取决于
There are 2500 U.S military personned with 6000 dependents stationed at the two bases.
两个基地驻扎有美国2500名军人及6000名家眷。
My father didn't mind whom I married, so long as I could stand on my own two feet and wasn't dependent on my husband.
只要我能够自食其力，不依附于自己的丈夫，嫁给谁我父亲倒是并不介意。
I resent being dependent on her.
我很讨厌自己对她的依赖。
Britain became increasingly dependent upon American technology
英国变得越来越依赖美国的技术了。
In his own way, he was dependent on her
他以自己的方式依赖着她。
The area is heavily dependent on tourism.
这个地区非常依赖旅游业。
A child's development is dependent on many factors.
孩子的成长受多种因素影响。
You can't be dependent on your parents all your life.
你不可能一辈子靠父母生活