★现在完成时的否定句型常见以下两种：

have/has+not/never+过去分词——不未/还没……

★实战演练：

She hasn't seen that movie yet.

她还没有看过那部电影。

I haven't heard from him yet.

我还没收到他的音讯。

I have never met him before.

我以前从未见过他。

He has never been out of his hometown.

他从未离开过家乡。