yet.but.however的区别.yet用于疑问句和否定句中,可是She is yet a child,和he was poor,yet happy

题目

yet.but.however的区别.yet用于疑问句和否定句中,可是She is yet a child,和he was poor,yet happy
前面2句是否定句吗?从哪里看出来?第二句为什么poor后面要加逗号?另求3者区别,感激不尽.

答案

这三个都是做连词表转折
but however 是逗号的区别,He is poor,but happy
He is poor,however,happy.(however 比较正式,换句话说就是写作文的时候用它比较受老师欢迎)
先纠正一下 你的说法 yet多用于疑问句和否定句中,但是用在肯定句的情况也不是没有
例；
肯定 Certain questions have yet to be clarified.
有些问题还需要弄清楚.《新英汉大辞典》
否定 She
didn't realize her mistake yet.
她还没有认识到她的错误.《21世纪大英汉词典》
疑问 Is he
up yet?
他起床了没有?《新英汉大辞典》
She is yet a child 她还是个孩子 这句中的yet 是副词 意思是 还
he was poor,yet happy 这句中的yet是连词 用法意思同but
一句话 做连词 but和yet 一样前边要有逗号,however 前后都要有逗号