But what I can tell you,is that it happens in the blink of an eye.is是不是多余的

熱心網友

is是不可少的.這個句子里有一個主語從句和一個表語從句.what i can tell you是主語從句，充當主語．that it happens in the blink of an eye是表語從句，充當表語．一個完整的句子必須有主系表結構，有了主語和表語，還要一個系動詞，用is.不知是否明白？

熱心網友

same

熱心網友

But what I can tell you,is that it happens in the blink of an eye.句子主語是what I can tell youis 是系動詞做謂語，是必不可少的該句中我能告訴你的是后面的從句that it happens in the blink of an eye 賓語