The city at one time must have been prosperous, for it enjoyed a high level of civilization.想问下这句话中at one time 都可以放在句子的什么位置，可以放在been之后吗？还有must have been 是推测的用法吗，可以详细解释一下吗，谢谢~
...说："If you liked this video, check out the first one on the Path of the voice, or the next one on Tongue exercise and Tongue relaxation."请教老师： 为什么要用虚拟语气liked？为什么不说If you like...？ 怎么理解含义？
原句：That is when U.S.
health officials ordered people to stay home to help stop the spread of the
coronavirus.请问老师，问：1. 句子开头That is when这是什么用法？属于什么从句？2. ordered...to stay home to help stop.....这里连用了两个不定式，分别是作什么...
...now better,” or “they see
the bigger picture,” were the catchphrases of my seasoned colleagues. 这是俄罗斯前外交官Boris Bondarev在《经济学人》应邀专栏写的一篇文章中的一句话。用were是因为语义一致的缘故吗？另外，两个逗号应该在引号的外面...
...ng.请问老师，这里的 non-finite clause 是否为internal complement of the VP?We hadn't counted on his being so insensitive.根据，剑桥学生语法书，这里的加粗字是 PP complement headed by on.另外，第一句中 Lisa 是否为 raised object？感谢老师答疑！
例句：[1] New Concept English are so well written books that you can find in almost every bookstore.[2] Do you ever have an idea which you’re so excited about that you want to tell everyone.问题：1. 以上两个句子的that可以替换为which吗？（我们之前得出的结论结论是第...
...a collar and tie for work.
他上班总是系着领带。2)People
who work inoffices are frequently referred to as "white-collar workers'
for the simple reason that they usually wear a collar and tie to go to work.坐办公室的之所以常常被称作“白领工人”，就是因为他们通常...
I have found a mobile phone . Do you know ( )?A.who the phone belonged toB.who is the owner of the phoneC.who the phone belongs to请问老师哪个是正确的呢？答案给了B，我感觉AC也说得通啊。谢谢老师指点。
... piano standing against the wall. 靠墙有一架钢琴。There’re a lot of difficulties facing us. 我们面临着很多困难。There is a door leading to the garden. 有一座门通往花园。 或者说：如何判别<现在分词>是作<定语>还是<补足语>?
尊敬的老师：您好！请教一下。McGee says leaving without a position lined up gave him time to reflect on what kind of company he wanted to run.在上面那句话中，without a position lined up 作什么成分？
...一句话：After 30 years, the EPA can point to progress against a number of environmental threats. 请问这句话里的 progress 是抽象名词吗？请问在它的前面可不可以加定冠词 the 呢？是不是抽象名词在任何情况下都不可以加定冠词呢？按照我的理...
One of the 23 with the myth is that it can prevent those who do not match the stereotype from 24 they have an eating disorder.23. A. projects B. problems C. proposals ...
These groups mainly rely for instilling needed dispositins into the yong upon the same sort of association which keeps the adults loyal to their group.请老师帮忙翻译并分析此句，谢谢！
What you really hope for is that whatever sub-B.A credentials people get, that they are portable at a minimum of across firms and ideally even across sectors and industries.老师好，请问that they are ……中that是什么用法？