Basic students: watch out! For today, I have a good explanation for Do and Does.
When we don't have the verb to be (I am/ you are/ he is/ she is/ it is/ we are/ you are/ they are), and we need to formulate questions and negative sentences, we have to use this auxiliary Do/Does.
Examples below:
Affirmative: I have a pencil.
Question: Do I have a pencil? - Negative: I don't have a pencil.
Affirmative: You have a pencil.
Question: Do you have a pencil? - Negative: You don't have a pencil.
Affirmative: He/She/It has a pencil.
Question: Does he/she/it have a pencil? - Negative: He/she/it doesn't have a pencil.
Affirmative: We have a pencil.
Question: Do we have a pencil? - Negative: We don't have a pencil.
Affirmative: They have a pencil.
Question: Do they have a pencil? - Negative: They don't have a pencil.
Here, I leave you these links (Better-English and Englisch-Hilfen) to do some exercises online, ok? Hope to have helped you. =)
