To form a
negation in the Past Simple use didn't + the first form of the verb. You can use the shortened form or the longer version. For example: Tom didn't/did not go on holiday. Exceptions: was, were and could. For that verbs the negation is formed with "not". For example: I wasn't/was not at the football match yesterday.
To form a
question put „did“ at the beginning of the sentence. Here again "did" is followed by the first form of the verb. For example: Did Tom go on holiday? If you want to form a question with "was, were or could" put the verbs at the beginning of the sentence. For example: Were you at home last night?
Be careful: Use were/weren't for you, we, they!