Negative yes/no questions

Use Yes/No questions when:

• This type of question is used to corroborate something that we think is true.

Ex: Isn't oscar excited for his birthday??  (Yes, he is)

Didn't you exercise last week?  (Yes, I trained very hard)

• It is used when we want someone to agree with us.

Ex: Don't you know your blog assignment is due today? (No, I had forgotten)

Wasn't your dance wrong? (No, that is the choreography)

• To express surprise.

Ex: Aren't you going to English class tomorrow? (Not really. I have a very important meeting, I'm sorry)

Haven't you eaten anything today? (Yes, but just a little)

The grammatical tenses of each verb

Verb to be (Isn't/Aren't): simple present

Verb to be (Wasn't/Weren't): simple past

Auxiliary Don't/Doesn't: simple present

Auxiliary Didn't: simple past

Auxiliary Hasn't/Haven't: present perfect