老师说，since 通常要与现在完成时连用，不管 since 是介词，还是连词，或是副词。
Since when have you lived here? 你是从什么时起开始住在这里的?
You haven’t changed much since we last met. 自从上次我们见面以来，你变化不大。
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The objective, since attained, was to create a set of contractual rules that would establish uniformity in that practice, so that practitioners would not have to cope with a plethora of often conflicting national regulations.请教老师：since attained作什么成份；conflicting此处什么词...
就是这道题，能不能填since which（虽然答案里没有这个选项，我就是想问一下）。since when＝since which time，那我直接填since which可以吗？用which指代1946，把这个1946就相当于普通的名词。然后就相当于The book was written in1946,and since 194...
since引导的时间短语或从句通常在句中作状语，但偶尔since短语或从句是名词的后置修饰语。此时since短语或从句与最高级或序数词连用。以下为夸克《大全》539页的说明：Apparent exceptions to the requirement of a perfective verb occur when a ph...
They have talked to him since morning.They have been talking to him since morning.这是前面一个网友提问中的两个句子，请问 since
morning 可以不用冠词吗？比如说成：They have talked to him since the morning.They have been talking to him since the morning.https://www.cpsen...
前面有朋友问了一个关于 since when 的问题，这让我想起了另一个与 since when 相关的的语法难点。你是从什么时起开始住在这里的?误：When have you lived here since? 正：Since when have you lived here? 请问这里的“误”为什么不对呢？难道这...
当 since 从句用一般过去时的时候，它对应的主句通常是用现在完成时或现在完成进行时的。如：She has played the piano since she was a child. 她从下就弹钢琴。I’ve loved you ever since I met you. 自从我见到你，我就一直爱你。They’ve moved twic...
He liked a wild life and Peru was much more like the country of giants where Tom had found him, than any place the big man had since visited.麻烦老师们帮我分析下since在这里的用法。这里的since可以理解为ever吗？
•Mr Lewis, living
with us since he returned, is now a well-known author. （葛传椝英语惯用法词典）•He is author of
the capital review of Anacreon in E. R. He is to be heard of at No. 30 Craven
Street , having lived with us since he came to town . （google图书）[问] 请问老师...