c. Ma Hong has always been a good student.
d. Have you ever been to the Great Wall ?
e. I have seen him this morning.
四.现在完成进行时:
1.构成: have / has been doing
2.特征: 现在完成进行时兼有现在完成时和现在进行时两者的特点
①.它具有现在完成时的特点, 即表示动作发生在过去, 延续到现在或对现在产生影响
②.它具有现在进行时的特点, 即可以表示此动作仍在进行或还会继续
a. Mr. Smith has taught English for twenty years. ( 至今为止教过二十年英语, 至于teach是否结束或是否延续, 不得而知)
b. Mr. Smith has been teaching English for twenty years.( 现在仍在教英语,而且将持续下去)
3.用法:
①.表示现在之前的一段时间里一直进行的动作, 此动可能仍在进行, 也可能刚刚停止
a. I have been reading the book all the morning.
b. He has been staying here for two hours.
c. I have been living in Beijing since 1972.
②.表示现在之前的一段时间里一再重复的动作
a. I have been calling you several times in the past two days.
4.现在完成时与现在完成进行时的区别: 前者着重表示过去动作对现在的影响或结果; 后者着重表示过去动作的持续进行
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