можете эти придложения поставить в виде вопроса а потом в отрецательном
1. she plays with her everyday
2. i bought it yesterday
3. i was doctor
4. i am playing tennis

Does she play with her everyday?

She doesn't play with her everyday

Did I buy it yesterday?

I didn't buy it yesterday

Was I a doctor?

I wasn't a doctor

Am I playing tennis?

I am not playing tennis