"Do you like chocolate?" "Yes, I do." "Do you like chocolate?" "Yes, I do."
Short answers are brief responses to a variety of closed questions.
| 'to be' | Other verbs |
|
'Yes' + subject + 'to be'
Is she French?
Yes, she is.
|
'Yes' + subject + 'to do'
Does she work in a bank?
Yes, she does.
|
|
'No' + subject + 'to be' + 'not'
Is she French?
No, she isn't.
|
'No' + subject + 'to do' + 'not'
Does she work in a bank?
No, she doesn't.
|
Note that
1. In affirmative forms, we don't use contractions: Yes, I'm. 
2. The correct forms for 'have' and 'have got' are:
Do you have any children? Yes, I do./No, I don't.
Have you got any children? Yes, I have./No, I haven't.
3. Remember to use 'to do' with main verbs:
Do you like tea? Yes, I like. Yes, I do. 
We use them in conversation in different tenses. Short answers are more polite than 'Yes' or 'No' alone.
"Does she work in a bank?"
"No." [too short and direct]
"No, she doesn't". [more polite]
Sometimes, we add more information:
"Does she work in a bank?"
"No, she's in advertising."/"No, she doesn't. She's in advertising." [these are better]
"Are you tired?" "No, I'm not. Are you?" "Yes, I am! Let's take a break!"
"Is it raining again?" "Yes, it is. But it's nice and warm."
See all other tenses and modal verbs for more information and examples.