这个句型应该说是我们比较常见的，比如，我们经常会说:

if you have any questions.feel free to call me!

意思是如果你有什么问题，欢迎随时联系我！

Sentence Pattern:(Please) feel free to...随便……。欢迎……。

Example:

1)Feel free to call come again.
欢迎再来。

2)Feel free to call me when you're in troube.
遇到麻烦请随时给我打电话。

3)Please feel free to call me.
请随时给我打电话。

4)Please feel free to ask me if you have any question.
如果你有什么疑问，请随时问我

5)Please feel free to stop by anytime.
请随时过来坐。

6)Please feel free to use my car whenever you need it.
需要用车时，请随便用我车