fluently

She can speak English fluently as she is always in practice.

她一直在练习, 所以英语讲得很利。

Speaking the language fluently certainly smoothed our path.

我们说语言很利, 确实给我们带来了许多方便。

You may be able to read French well, but speaking it fluently is a different kettle of fish entirely.

你也许能很利地看法语，但要利地说法语就是另一码事了。