must suffocate
Regular verb: suffocate - suffocated- suffocated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must suffocate
you must suffocate
he must suffocate
we must suffocate
you must suffocate
they must suffocate 	I must be suffocating
you must be suffocating
he must be suffocating
we must be suffocating
you must be suffocating
they must be suffocating	I must have suffocated
you must have suffocated
he must have suffocated
we must have suffocated
you must have suffocated
they must have suffocated	I must have been suffocating
you must have been suffocating
he must have been suffocating
we must have been suffocating
you must have been suffocating
they must have been suffocating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not suffocate
you must not suffocate
he must not suffocate
we must not suffocate
you must not suffocate
they must not suffocate 	I must not be suffocating
you must not be suffocating
he must not be suffocating
we must not be suffocating
you must not be suffocating
they must not be suffocating	I must not have suffocated
you must not have suffocated
he must not have suffocated
we must not have suffocated
you must not have suffocated
they must not have suffocated	I must not have been suffocating
you must not have been suffocating
he must not have been suffocating
we must not have been suffocating
you must not have been suffocating
they must not have been suffocating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I suffocate?
must you suffocate?
must he suffocate?
must we suffocate?
must you suffocate?
must they suffocate? 	must I be suffocating?
must you be suffocating?
must he be suffocating?
must we be suffocating?
must you be suffocating?
must they be suffocating? 	must I have suffocated?
must you have suffocated?
must he have suffocated?
must we have suffocated?
must you have suffocated?
must they have suffocated? 	must I have been suffocating?
must you have been suffocating?
must he have been suffocating?
must we have been suffocating?
must you have been suffocating?
must they have been suffocating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not suffocate?
must you not suffocate?
must he not suffocate?
must we not suffocate?
must you not suffocate?
must they not suffocate? 	must I not be suffocating?
must you not be suffocating?
must he not be suffocating?
must we not be suffocating?
must you not be suffocating?
must they not be suffocating? 	must I not have suffocated?
must you not have suffocated?
must he not have suffocated?
must we not have suffocated?
must you not have suffocated?
must they not have suffocated? 	must I not have been suffocating?
must you not have been suffocating?
must he not have been suffocating?
must we not have been suffocating?
must you not have been suffocating?
must they not have been suffocating?