问一个简单的英语句子.关于语法的!

题目

问一个简单的英语句子.关于语法的!
He was dressed in a black suit
我就是搞不懂,为什么要用个 “ was ” ,他穿着一套黑衣服,这句话也不是被动语态呀 .那为什么不是：He dressed in a black suit .一个动词就够了嘛.干嘛还要一个be动词呢
实在没有分数了 不好意思 ..实在不懂!

答案

is = was was是过去式.
he is dress in a black suit
he was dressed in 已经过去了,所以dress 要加ed.
如果你写 he dressed in a black suit.那dressed就会解释成动词.
口语可以这样说.但grammar语法上一定要加was.
Thanks :-)