I must defrost you must defrost she must defrost we must defrost you must defrost they must defrost
V-ing form
I must be defrosting you must be defrosting she must be defrosting we must be defrosting you must be defrosting they must be defrosting
Perfect
I must have defrosted you must have defrosted she must have defrosted we must have defrosted you must have defrosted they must have defrosted
V-ing perfect
I must have been defrosting you must have been defrosting she must have been defrosting we must have been defrosting you must have been defrosting they must have been defrosting
Negation
Simple form
I must not defrost you must not defrost she must not defrost we must not defrost you must not defrost they must not defrost
V-ing form
I must not be defrosting you must not be defrosting she must not be defrosting we must not be defrosting you must not be defrosting they must not be defrosting
Perfect
I must not have defrosted you must not have defrosted she must not have defrosted we must not have defrosted you must not have defrosted they must not have defrosted
V-ing perfect
I must not have been defrosting you must not have been defrosting she must not have been defrosting we must not have been defrosting you must not have been defrosting they must not have been defrosting
Interrogative form
Simple form
must I defrost? must you defrost? must she defrost? must we defrost? must you defrost? must they defrost?
V-ing form
must I be defrosting? must you be defrosting? must she be defrosting? must we be defrosting? must you be defrosting? must they be defrosting?
Perfect
must I have defrosted? must you have defrosted? must she have defrosted? must we have defrosted? must you have defrosted? must they have defrosted?
V-ing perfect
must I have been defrosting? must you have been defrosting? must she have been defrosting? must we have been defrosting? must you have been defrosting? must they have been defrosting?
Interro-negative form
Simple form
must I not defrost? must you not defrost? must she not defrost? must we not defrost? must you not defrost? must they not defrost?
V-ing form
must I not be defrosting? must you not be defrosting? must she not be defrosting? must we not be defrosting? must you not be defrosting? must they not be defrosting?
Perfect
must I not have defrosted? must you not have defrosted? must she not have defrosted? must we not have defrosted? must you not have defrosted? must they not have defrosted?
V-ing perfect
must I not have been defrosting? must you not have been defrosting? must she not have been defrosting? must we not have been defrosting? must you not have been defrosting? must they not have been defrosting?