问题描述：
Tomorrow will be rainy.We won't go climbing.(改为if引导的复合句）
→ We wouldn't go climbing if it was rainy tomorrow.
这是正确答案.
为什么不能改为：
We won't go climbing if it be rainy tomorrow.
为什么答案中用过去时那？
→ We wouldn't go climbing if it was rainy tomorrow.
这是正确答案.
为什么不能改为：
We won't go climbing if it be rainy tomorrow.
为什么答案中用过去时那？
问题解答：
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