Since 用来说明动作起始时间,for用来说明动作延续时间长度。 I have lived here for more than twenty years. I have lived here since I was born.. My aunt has worked in a clinic sinc...
1)It is the first / second time…. that…结构中的从句部分,用现在完成时。 It is the first time that I have visited the city. It was the third time that the boy had been late. 2)T...
1)过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作;现在完成时为过去发生的,强调过去的事情对现在的影响,强调的是影响。 2)过去...
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1)下列动词:come, go, arrive, leave, start, begin, return的一般现在时表将来。这主要用来表示在时间上已确定或安排好的事情。 The train leaves at six tomorrow mornin...
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1) shall用于第一人称,常被will 所代替。 will 在陈述句中用于各人称,在争求意见时常用于第二人称。 Which paragraph shall I read first. Will you be at home at seven t...
used to + do:"过去常常"表示过去习惯性的动作或状态,但如今已不存在。 Mother used not to be so forgetful. Scarf used to take a walk. (过去常常散步) be used to + doing:...