She talked ungrammatically but fluently.

她讲话不符合语法规则，却很流利。

He spoke fluently and without unnecessary hesitations.

他说得很流畅，毫不支吾。

She speaks French very fluently, but her pronunciation lets her down.

她法语讲得很流利，但美中不足的是发音不大好。

We were doubly lucky inasmuch as my friend was living on the island and spoke Greek fluently.

我们真是幸运极了，因为我的朋友住在岛上而且希腊语说得很流利。

I can't speak English fluently as I am out of practice.

我不能流利地说英语，因为我已荒疏了。