题目内容

20.预订机票时,你必须出示身份证.
You have to show your ID card when you book a plane ticket..

分析 You have to show your ID card when you book a plane ticket.

解答 答案:You have to show your ID card when you book a plane ticket.表达的是客观事实用一般现在时,when引导的时间状语从句,主语you,book预订,故when you book a plane ticket,主句主语you,have to不得不,后加原形show出示,your ID card身份证,故答案是You have to show your ID card when you book a plane ticket.

点评 have to表示客观需要做的事情,意思是"必须"、"不得不".后跟动词原形,有人称、
时态和数的变化,与情态动词 must 近义.

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