besoins d’aide svp en anglais sur le prétérit merci

1) usually est l'intrus car ce n'est pas un indice de temps

2) Je ne peux pa ste répondre car tu n'as pa smis le texte qui va avec

3) Do the murderer forgot to clean his fingertips ?

   The murderer didn't forgot to clean his fingertips

Did the suspect had a good alibi ?

The suspect didn't had a good alibi

Did the investigation was complcate ?

The investigation wasn't complicated

Did the police interrogated the witness ?

The police didn't interrogated the witness