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英语疑难问题Anevenhardersituationistobeontheplatformingoodtimeforatrainandstilltoseeitgooffwithoutyou.不太了解betodo的用法,

题目详情
英语疑难问题
An even harder situation is to be on the platform in good time for a train and still to see it go off without you.
不太了解be to do 的用法,
▼优质解答
答案和解析
1. be to do表示将来时间.如:I am to leave tomorrow.
2. be + to do(to do 充当表语,解释主语内容.这时,常可以与主语位置互换,意思不变)如你的句子可换成:
To be on the platform in good time for a train and still to see it go off without you is an even harder situation.
My idea is to leave tomorrow.
=To leave tomorrow is my idea.