Please feel free to have another. 別客氣,再來一個。
Feel free to stay here as long as you like. 想待多久就待多久。
Feel free to ask if you have any questions. 如果有問題的話,可以隨便問。
Feel free to stay here as long as you like. 只要你喜歡,想待到什么時候就待到什么時候。
It's very kind of you to say so. 你能那么說,我很高興。