【英文諺語】----provided that / on condition that

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provided that / on the condition that. (假如；在…條件下)

e.g.
a) I will come, provided that I am invited.
b) I will help you, provided that you pay me.
c) You can go there on condition that you don't come back late for dinner．你可以去那兒，條件是回來吃飯不能太晚。