有时.只在条件句或主句中使用虚拟语气.而另一分句用陈述语气. If you should change your mind, do let me know. Should anyone call . please tell them that I’m busy. Can you read that form carefully, if you wouldn’t mind, and then sign it? I would appreciate it if you call back this afternoon for the doctor's appointment. -What would you do if it rains tomorrow? -We have to carry it on, since we’ve got everything ready. 【
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