please feel free to... 请随时
例句：
Please feel free to ask me questions anytime.
请尽管随时来问我问题。
Please feel free to come to my house and have a dinner with me because I'm staying alone.
我现在一个人住，欢迎随时来我家陪我一起吃饭。
A：Please feel free to tell me when you need help.
如果你需要帮助请随时开口。
B:You are my true friend who always be there for me no matter how hard I have.
你是我真心朋友，无论我有多困难都会在我身边。