under
under no circumstances后常跟什么时态？
no circumstances后常跟什么时态？
Under no circumstances to the this the first time he has lied.
考查倒装句。否定词放在句首使用部分倒装，从句不倒装，主句倒装。固定句型：this is the first time后跟从句用现在完成时态。根据题中Under no circumstances 绝不，放在句首.
Under no circumstances ．did I expect that I would meet so many problems when I decided to take to the job.
考查倒装结构。
句中否定词Under no circumstances在句首，主句的主谓倒装，根据语境时态用一般过去时.
no matter how用倒装吗？
no matter how是不需要主谓倒装的，这里no matter表示让步含义，没有多少否定的意思。
如:
No matter how well you know Paris, it is easy to get lost
不管你对巴黎多么熟悉，也很容易迷路。
No matter how far it is, Ill go there anyhow.
什么远不远的，我去定了。
又如:
No matter how hard I tried, it was impossible to fill this beautiful pen with ink and to this day it has never written a single word!
这里no matter how 引导让步状语从句，how 修身hard，因此hard 在前面；
hard I tried 不是倒装句。
倒装句是指“主语在谓语之后”的语序，即动词（全部或者部分）在主语前面。这里谓语tried 在I 后面，这是正常语序。
不同时态的倒装句子？
have I been abroard.
2.He has done his homework. So have I.
loudly did he speak that every one of the class could hear him.
once did they change their plan.
do I go shopping.
is fond of cooking. So does my sister.
7. Never will the woman forget the day in 1960 when she first came to the city.
8.He will go to Hainan for the holiday. So will David.
it rain tomorrow, we would have to put off the visit to Yangpu Bridge.
would he go to America if his parents did not give their permission.