请老师分一下这个句子的三种时态，尤其是后两个谓语动词部分为什么一个用完成时一个不用？He (has written) several novels since 1985.
Most of them (have been) very
successful, but the last one (didn't get)
very good reviews.
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。
...
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...
在主句为一般过去时的句子中 as though 引导的状语从句如果用虚拟语气谓语可以不是 have done 而是 did 吗?But what else could they do on that dark winter's day when the last of
their store of grain was gone, when the trees were cut and sold, when he had
sold everything,...