be going to / will 用于条件句时,be going to表将来,will表意愿。例如:
If you are going to make a journey, you'd better get ready for it as soon as possible.
如果你打算去旅行,最好尽早做准备。
Now if you will take off your clothes, we will fit the new clothes on you in front of the mirror.
如果你愿意现在脱衣服,我们可以在镜子前为你试新衣服。
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