She has finished her homework为什么要加has而不直接she finished her homework 原句:she has finished her homework and now she is watching TV.

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Shehasfinishedherhomework为什么要加has而不直接shefinishedherhomework原句:shehasfinishedherhomeworkandnowsheiswa

She has finished her homework为什么要加has而不直接she finished her homework 原句:she has finished her homework and now she is watching TV.
She has finished her homework
为什么要加has而不直接she finished her homework
原句:she has finished her homework and now she is watching TV.

She has finished her homework为什么要加has而不直接she finished her homework 原句:she has finished her homework and now she is watching TV.
从两个原因考虑:1.如果前半句是一般过去时,应该有一个过去时的时间状语,而这句话里却没有,所以从既要表示过去完成含义,有要满足句子基本要求的角度,用现在完成时可以不需要时间状语.2.第二个原因就是一整句话中最好保持基本时态一致.所以用现在完成时,与后面的现在进行时保持时态一致.

强调的是她已经完成了作业了

用finished也可以。但是have finished更有“已经完成”的含义
过去时和完成时很多时候是说话人需要侧重点不同而采纳不同的时态的，一般我们考试中常见的都是很死板的语法要求，根据前后语句判断肯定是某个时态，单看你那句话的话，我觉得用一般过去时没什么语法错误，但是用完成时更有感觉。...

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用finished也可以。但是have finished更有“已经完成”的含义
过去时和完成时很多时候是说话人需要侧重点不同而采纳不同的时态的，一般我们考试中常见的都是很死板的语法要求，根据前后语句判断肯定是某个时态，单看你那句话的话，我觉得用一般过去时没什么语法错误，但是用完成时更有感觉。

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记住,完成时强调影响
也就是说,这句子中
正式由于完成了作业,它才能看电视

我认为：主语+have/has+动词的过去分词=现在完成时

She has finished all her work by 8 o'clock. She has dread finished her homework.(改为一般疑问句） She said she ______ her exams by then.选项:a、has finished b、finished c、would have finished d、 She has finished her homework为什么要加has而不直接she finished her homework 原句:she has finished her homework and now she is watching TV. She has't finished reading the book you lent her ______.A.yet B.still she has already finished her work 变一般疑问句怎么变? she has finished her homework,根据主谓一致,主语单数,谓语用动词单数,have变为has,那谓语动词是has还是finished呀 Ask her to come and see me when she ____ her work.A) will finish B) finishes C) has finished D) had finished 2 Ask her to come and see me when she ____ her work.A) will finish B) finishes C) has finished D) had finished Has she got her 请教这个句子是全部倒装吗请教这个句子是全部倒装吗She has finished her homework,so has her brother She's already finished her chart.(变为否定句)She _______ finished her chart ______. She finished her homework quickly（对划线部分提问）划线部分是finished her homework Miss Li has already finished her work . 变为一般疑问句 Kitty has already finished her homework.(一般疑问句） the girl has finished her homework.the boy has finished his homework toothe girl has finished her homework.________ _________the boy改为同义句 she‘s already finished her work 改为否定句 同义词：Lise went to bed after she finished her homework.