I have read that book before BEFORE可以用在现在完成时肯定句吗

问题描述:

I have read that book before BEFORE可以用在现在完成时肯定句吗

在此before是副词.如在句末,谓语通常用现在完成时.如:I haven't seen the film before.
I have seen him before.意思是可用肯定句咯是的。