if the clone technology is carried out on human beings.

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,

送253个香吻 1年前已收到2个回答举报

zxhcsu 幼苗

共回答了18个问题采纳率：83.3% 举报

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,.

1年前

小小1010 幼苗

共回答了830个问题举报

这里是过去分词（不是过去式），和前面的 be动词一起构成被动语态
被动语态的构成 be done

1年前

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