Inversion refers to an irregular verb placement form where the question form takes the place of the standard positive sentence structure. Some examples of inversion include using "not only do I enjoy classical music" instead of "I not only enjoy classical music". Inversion can also occur with negative adverbials like "never", "rarely", and expressions like "only then", "only after", "little", "so", "such", and in conditional forms by dropping "if" and using the inverted form instead.

1. Inversion refers to an irregular verb placement form: Use of Question Form In this case, the question form (auxiliary + subject + main verb) takes the place of the standard positive sentence structure: Examples : I not only enjoy classical music, but I also have a season ticket to the symphony. Not only do I enjoy classical music, but I also have a season ticket to the symphony.

2. Negative Adverbials Time expressions: never, rarely, seldom I have never been more insulted! Never have I been more insulted! He has seldom seen anything stranger . Seldom has he seen anything stranger.

3. Time expressions: hardly, barely, no sooner, or scarcely As soon as he had finished dinner, she walked in the door. No sooner had he finished dinner, when she walked in the door.

4. After 'Only‘ : Expressions such as 'only after', 'only when', 'only then ', etc. I only understood the problem then. Only then did I understand the problem. The teacher only makes a comment after understanding the situation. Only after understanding the situation does the teacher make a comment.

5. After 'Little' 'Little' is used in a negative sense. He understood the situation very little. Little did he understand the situation. I have read little concerning nanotechnology. Little have I read concerning nanotechnology .

6. Inversion after 'So', 'Such', and 'That' 'So' The situation was so strange that I couldn’t sleep. So strange was the situation that I couldn't sleep. The test is so difficult that students need three months to prepare. So difficult is the test that students need three months to prepare. .

7. 'Such' The moment is such that everything else does not count. Such is the moment that everything else does not count. Dreams are made of that stuff. Such is the stuff of dreams.

8. Inverted Conditional Forms Sometimes conditional forms are inverted as a means of sounding more formal. In this case, the conditional 'if' is dropped and the inverted forms take the place of the 'if clause'. If he had understood the problem, he wouldn’t have committed those mistakes. Had he understood the problem, he wouldn't have committed those mistakes. If he should decide to come, please telephone. Should he decide to come, please telephone.