yet是什么时态的否定?

yet是什么时态的否定? yet是什么时态的时间状语标志? he hasn't come yet是什么时态? have you packed yet?是什么时态急 He has not had breakfast yet.是什么时态?He is still washing the dishes.改成和问题一样的时态 一般将来时态肯定句.否定句.疑问句的基本结构是什么 否定句 Has he returned the library book yet?是什么时态? yet用于什么时态 1.He is still combing his hair.（用yet改为现在完成时态的否定句） 具体看下面1.He is still combing his hair.（用yet改为现在完成时态的否定句）2.The boy in green is Jim.（对划线部分提问）3.Li Lei is good at pla not yet的英文是什么 yet只能用在否定和疑问句的句尾吗 为什么过去完成时的否定句里面要加yet yet用于否定,在现在完成时里的意思 already,yet 用于什么时态 一句句子语法he (has not yet returned).he will (returned) in ten minutes.用短语动词be改写括号中的内容,isn't back yet.he will be back in ten minutes.我的问题是he isn't back yet是什么时态能改成he hasn't be back yet 这个是什么时态的 现在完成时所用的动词时态是什么时态? 这句简单的英语用的是什么时态?请帮忙看一下hasn't anyone repaired this car yet?这句话能算是被动语态下的现在完成时吗?最近各种时态一下学的比较多,有点头晕.