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if the clone technology is carried out on human beings.

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if the clone technology is carried out on human beings.
小弟不懂语法,这里CARRY为什么用过去式?这是什么语法,可以帮我详解举例下么.复制的也行,想系统学下,
if the clone technology is carried out on human beings.
is carried out这用的是被动语态,句子的意思是:若克隆技术用到人类身上.
be+动词的过去分词构成被动语态 例如:He is called as "big brother".
希望能帮到您,.