When is inversion used?

Click the selected answer; there are several correct answers.

1.   When the sentence is a question.
2.   When the indication of time comes at the end of the sentence.
3.   When the indication of place comes at the beginning of the sentence.
4.   When the indication of time comes at the beginning of the sentence.
5.   When the indication of place comes at the end of the sentence.
6.   When an interrogative pronoun comes at the opening of the sentence.