must compress
Regular verb: compress - compressed- compressed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must compress
you must compress
she must compress
we must compress
you must compress
they must compress 	I must be compressing
you must be compressing
she must be compressing
we must be compressing
you must be compressing
they must be compressing	I must have compressed
you must have compressed
she must have compressed
we must have compressed
you must have compressed
they must have compressed	I must have been compressing
you must have been compressing
she must have been compressing
we must have been compressing
you must have been compressing
they must have been compressing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not compress
you must not compress
she must not compress
we must not compress
you must not compress
they must not compress 	I must not be compressing
you must not be compressing
she must not be compressing
we must not be compressing
you must not be compressing
they must not be compressing	I must not have compressed
you must not have compressed
she must not have compressed
we must not have compressed
you must not have compressed
they must not have compressed	I must not have been compressing
you must not have been compressing
she must not have been compressing
we must not have been compressing
you must not have been compressing
they must not have been compressing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I compress?
must you compress?
must she compress?
must we compress?
must you compress?
must they compress? 	must I be compressing?
must you be compressing?
must she be compressing?
must we be compressing?
must you be compressing?
must they be compressing? 	must I have compressed?
must you have compressed?
must she have compressed?
must we have compressed?
must you have compressed?
must they have compressed? 	must I have been compressing?
must you have been compressing?
must she have been compressing?
must we have been compressing?
must you have been compressing?
must they have been compressing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not compress?
must you not compress?
must she not compress?
must we not compress?
must you not compress?
must they not compress? 	must I not be compressing?
must you not be compressing?
must she not be compressing?
must we not be compressing?
must you not be compressing?
must they not be compressing? 	must I not have compressed?
must you not have compressed?
must she not have compressed?
must we not have compressed?
must you not have compressed?
must they not have compressed? 	must I not have been compressing?
must you not have been compressing?
must she not have been compressing?
must we not have been compressing?
must you not have been compressing?
must they not have been compressing?