英语动词时态问题~when 和untilI'll go with you when I have finished my homework.Don't leave the classroom until your homework is finished.这两句话的时态是对的吧?为什么一个有现在完成时,另一个用一般现在时啊,

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英语动词时态问题~when 和untilI'll go with you when I have finished my homework.Don't leave the classroom until your homework is finished.这两句话的时态是对的吧?为什么一个有现在完成时,另一个用一般现在时啊,
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英语动词时态问题~when 和untilI'll go with you when I have finished my homework.Don't leave the classroom until your homework is finished.这两句话的时态是对的吧?为什么一个有现在完成时,另一个用一般现在时啊,
英语动词时态问题~when 和until
I'll go with you when I have finished my homework.
Don't leave the classroom until your homework is finished.
这两句话的时态是对的吧?为什么一个有现在完成时,另一个用一般现在时啊,

英语动词时态问题~when 和untilI'll go with you when I have finished my homework.Don't leave the classroom until your homework is finished.这两句话的时态是对的吧?为什么一个有现在完成时,另一个用一般现在时啊,
第一个句子是错的,when引导的时间状语从句,主句用一般将来时,从句用一般现在时.即使把主句换成一般现在是也是错的
第二个对
这只是固定的一种结构,
until不能用于一般将来时
这是一种规定,没有为什么,死记就可以了

第一个用一般现在时就可以I'll go with you when I finish my homework.
第二个正确

其实第一句可以用一般现在时的
第二句就不一定能换了