现在完成时与现在完成进行时的区别 Present Perfect Tense -Simple or Continuous--FOR & SINCE, 视频播放量 2、弹幕量 0、点赞数 0、投硬币枚数 0、收藏人数 0、转发人数 0, 视频作者 hidream123, 作者简介 ,相关视频:英语 语法 现在完成时 The Present Perfect Tens
需要注意的是,当since表示时间关系时,它通常与过去完成时态(present perfect)连用,以强调动作或状态的持续性或延续性。过去完成时态由have/has +过去分词构成。 另外,since还有其他的用法,例如用于表示原因、从句引导词等,但本文主要关注其用于表示时间关系的用法。 总结起来,通过上述例句和解析,我们可以看出,since常用...
A. Read the examples and discuss the difference between for and since. Then complete the rules.a. A: How long have you been a volunteer?Use:• The Present Perfect Simple for an action which started in the past and continues up to the present....
1AThe present perfect tense with since and forWe often use since and for with the present perfecttense.I have not laughed like this since my childhood.The Greeks have tried to capture our city for ten years.Work out the ruleWe use since with (a period of time/a point in time).We use...
1. prep. ( used with the present perfect or past perfect tense 与现在完成时或过去完成时连用) from a time in the past until a later past time, or until now 自…以后;从…以来 ①since后接某一确定的时间点(如具体的年、月、日期、钟点等),主句谓语动词是延续性动词,常用完成时态。She's been...
We use the present perfect simple to talk about unfinished actions and states that started in the past and continue until now.我们用现在完成时来谈论未结束的动作和状态，这些动作和状态从过去开始，一直持续到现在。We've been good friends since high school.我们从高中开始就是好朋友了。We use how ...
1. prep. ( used with the present perfect or past perfect tense 与现在完成时或过去完成时连用 ) from a time in the past until a later past time, or until now 自…以后；从…以来 ①since后接某一确定的时间点（如具体的年、月、日期、钟点等），主句谓语动词是延续性动词，常用完成...
( used with the present perfect or past perfect tense 与现在完成时或过去完成时连用 ) from a time in the past until a later past time, or until now 自…以后;从…以来 ①since后接某一确定的时间点 (如具体的年、月、日期、钟点等...
现在完成时（Present perfect）过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态.过去完成时(past perfect)：①表示发生在过去的动作对现在造成的某种影响或结果,用来指定在另一个过去行动之前就已经完成了的一个事件.②过去某动作一直持续到...
Whensinceintroduces a state in the past that is still continuing in the present, we use a present perfect form of the verb aftersinceand a present perfect form of the verb in the main clause: 当since引入过去的一种状态,而这种状态仍在现在进行时,我们在since之后使用动词的现在完成时形式,在主句...