FORM: Negative
Present Simpleam/ is/ are + NOT + V3The room is not cleaned once a week.
Present Continuousam/ is/ are + NOT + being + V3The room is not being cleaned now.
Present Perfecthave/ has + NOT + been + V3The room has not been cleaned twice.
Past Simplewas/ were + NOT + V3The room was not cleaned yesterday.
Past Continuouswas/ were + NOT + being + V3The room was not being cleaned when my mum came.
Past Perfecthad + NOT + been + V3The room had not been cleaned by 2 o'clock.
Future Simple
will + NOT + be + V3
The room will not be cleaned tomorrow.
Modalsmodal + NOT + be + V3The room should not be cleaned.