Eng: If there is

If there is a problem with the actual system

如果實際系統有問題

If there is any

如果有的話

If there is anything you don't understand

如有不清楚

If there is no relationship between two ideas

如果兩個想法之間沒有關係

If there is no space

如果沒有空間

If there is one

如果有的話