Tomorrowwillberainy.Wewon'tgoclimbing.(改为if引导的复合句)
→Wewouldn'tgoclimbingifitwasrainytomorrow.
这是正确答案.
为什么不能改为:
Wewon'tgoclimbingifitberainytomorrow.
为什么答案中用过去时那?