问题 为什么说成be sworn in as 被动语态结构呢？

VOA:A less sweeping immigration ban was later upheld but is likely to be reversed by Joe Biden who will be sworn in as President Jan 20th.为什么说成be sworn in as 被动语态结构呢？

问题 用法疑问:We are exercised in boxing once a week.

《葛传椝英语惯用法词典》上有这样一句：不可说 We exercise in boxing once a week，该说 We are exercised in boxing once a week.但我查手头的词典都没有查到这类用法，请教各位专家。

问题 在中秋节晚上用什么介词(on还是in）

请问：在中秋节晚上，是 in the mid-autumn night 还是on the mid-autumn night？如何确定其中的介词。

问题 It was in 1952后接when还是that

请问老师这个题的空格中应该填when还是that.It was in 1952_____ I first visited this city.

问题 the English expression in question的理解与翻译

And if you happen to know the English expression in question, translation becomes easy.

问题 at the library 和 in the library 的区别

请问：at the library 和 in the library 有区别吗？谢谢！

话题 That's due in part

话题 not in the least的用法

话题 every once in a while

话题 be in for a shock

话题 in the same way as

话题 A King in New York

话题 in the same way that

话题 with butterflies in my stomach

话题 the first in doing sth