also/ as well/ too/ either 也
Ⅰ. also较正式,位置通常靠近动词,用于句中;且用于肯定句中。如:
① He also plays football. 他也踢足球。
② I was also there.我也在那儿。
Ⅱ. too 多用于口语,通常置于句末,前边须用逗号隔开,也可用于句中,且前后均须用逗号隔开,;用于肯定句中。如:
① He is a worker, too.
② The two cows, too, are white.那两头奶牛也全都是白的。
Ⅲ. as well 是副词短语,多用于口语,只用于句末。如:
① She not only taught us English but taught us maths as well.她不但教过我们英语,还教过我们数学。
② He is a teacher and a writer as well.他是位教师,也是一位作家。
Ⅳ. either 用于否定句中,常置于句末。在肯定句变否定句时,其中的also, too, as well都要改为either.
① Yesterday I didnt watch TV and I didnt see the film, either .昨天我没有看电视,也没有看电影。
for / from / since
Ⅰ. 三者都能用来表示时间,但用法不同。
since 自从,所表示的是一个时间点。可用作介词,也可用作连词,后接时间名词或短语,或引导时间状语从句;要求前面的谓语动词或主句的谓语动词必须用完成时态,要用延续性动词。而since引导的从句中的谓语动词通常应是短暂性的动词。若接时间,则应为点时间。如:
① He has worked there since1989.
② She has lived here since she moved here.
Ⅱ. from 自从 只用作介词,表一个事情的开始点,可用于过去、现在或将来的时态。如:
① They worked from 7:00 to 12:00 this morning.
② We have been good friends from childhood.
Ⅲ. for 作为介词,后面接段时间,用于完成时、现在时、过去时和将来时,句中要用延续性动词。如:
① Well stay here for ten minutes.我们将在这儿呆10分钟。
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