often经常 never从不 ever曾经 before之前 since自从 once一次,曾经 twice两次 three times三次
He has never been ill in his life. I have been to the Summer Palace twice. We have visited Louvre Museum before.
Have you combed your hair _y_e_t_.
3. He has _a_l_re__a_d_y__ watched a video.
He has not watched a video _y_e_t现在,而且可能继续下去的动作或状态,常和表示一段时间的状语连用。
3 现在完成时的用法--1.结束 ② 表示开始于过去的动作最近刚结束
时间状语: just 刚刚 already已经
yet还,迄今(用于否定句);已经(用于疑问句)
3 现在完成时的用法--1.结束
just
刚刚
I have just bought an iPhone X. Tom has just cleaned his room. Lucy has just seen a horrible accident.
3 现在完成时中延续性动词和终止性动词
延续性动词:能与表示延续的时间状语连用 终止性动词:动作的发生与结束于一瞬间完成,不能再延续 即不能与表示一段时间的状语, for+时间段, since+时间点/从句 连用,也不能用在how long引导的特殊疑问句。
3 现在完成时中延续性动词和终止性动词
延续性动词
3 现在完成时的用法--1.结束
already 已经(用于肯定句)