If you should change your mind, do let me know.
假如你改变主意的话，一定要告诉我。
Let me know if you change your mind.
如果你改变主意的话就告诉我。
Let me try and change your mind.
让我努力改变你的想法。
Should you change your mind, please let me know.
如果你改变主意，请让我知道。
If you should change your mind, please let me know.
如果你改变注意，请告诉我。
If you should change your mind, please let me know.
如果你改变注意，请告诉我。
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