在英语越来越普及的21世纪，英语水平的高低已经成了大学生是否能找到好工作的评定标准。为帮助大学生掌握权威的英语知识。特提供以下资料：
Inversion 倒装
带否定意义的副词置于句首时
带否定意义的词置于句首时，主谓语需要倒装。
Rarely does he go to the movies.
Not for a moment did he doubt the truth of her honesty.
Little do I know about the meaning of this proverb.
Never before the night had I felt the extent of my power.
含有否定词的介词短语在句首时
含有否定词的介词短语在句首时，句子主谓倒装。
这类介词短语包括：in no case, at no time, in no way, by no means, on no account, in no sense, under no circumstances, 等等。意思为“决不，在任何情况下都不。”
“Only+状语”置于句首时的倒装
“Only+状语”置于句首时，主谓语需要倒装。
1) Only by practicing a lot outside class can we speak English fluently.
2) Only when I saw him did I remember that I promised to bring him a gift.
3) Only then did I know that I was wrong.
not only位于句首时的倒装
句首是not only且连接分句结构时，引起局部(部分)倒装。
Not only did we lose our money, but we were also in danger of losing our lives.
Not only can he sing very well, but he can also play some musical instrument very skillfully.
neither，nor表示“也不”时的倒装