A: .... you like chocolate? B: Yes, I do.
Do
A: ... he have breakfast in the morning? B: No, he ....
Does, doesn't
A: ... we want to drink juice today? B: No, we ...
Do, don't
A: Do they speak English? B: Yes, they ...
do
A: Does she live in São Paulo? B: Yes, she ....
does
A: ... I understand Portuguese? B: Yes, I ...
Do