Auxiliary verbs

To agree with someone (affirmative sent.: SO; negative sent.: NEITHER

structure: so / neither + subject + pronoun

example: A: I went to the park yesterday. B: SO did I

Example: A: I wasn't ill last month. B: NEITHER was I.

To show emphasis

Structure: Pronoun + affirmative auxiliary

Example: A: You didn't send me the report! B: I DID send it! In fact, I sent it two hours ago!

To avoid repetition

Example: Pronoun + aux.

Example: I went to the gym twice this week, but Mark DIDN'T.

Reply questions (to show interest)

Structure: aux + pronoun

Example: A: I bought a new jacket yesterday. B: DID you? Great!

Question tags (to make sure you're right)

Structure: aux + pronoun

Example: You haven't been to England, HAVE you?

Remember to use the SAME AUXILARY VERB AS THE PREVIOUS SENTENCE!!!

To show you are / think in a different way

Structure: Pronoun + aux

Example: A: I love chocolate. B: I DON'T.