must suffocate
Regular verb: suffocate - suffocated- suffocated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must suffocate
you must suffocate
she must suffocate
we must suffocate
you must suffocate
they must suffocate 	I must be suffocating
you must be suffocating
she must be suffocating
we must be suffocating
you must be suffocating
they must be suffocating	I must have suffocated
you must have suffocated
she 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
she 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 mustn't suffocate
you mustn't suffocate
she mustn't suffocate
we mustn't suffocate
you mustn't suffocate
they mustn't suffocate 	I mustn't be suffocating
you mustn't be suffocating
she mustn't be suffocating
we mustn't be suffocating
you mustn't be suffocating
they mustn't be suffocating	I mustn't have suffocated
you mustn't have suffocated
she mustn't have suffocated
we mustn't have suffocated
you mustn't have suffocated
they mustn't have suffocated	I mustn't have been suffocating
you mustn't have been suffocating
she mustn't have been suffocating
we mustn't have been suffocating
you mustn't have been suffocating
they mustn't have been suffocating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I suffocate?
must you suffocate?
must she suffocate?
must we suffocate?
must you suffocate?
must they suffocate? 	must I be suffocating?
must you be suffocating?
must she be suffocating?
must we be suffocating?
must you be suffocating?
must they be suffocating? 	must I have suffocated?
must you have suffocated?
must she 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 she 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 	
mustn't I suffocate?
mustn't you suffocate?
mustn't she suffocate?
mustn't we suffocate?
mustn't you suffocate?
mustn't they suffocate? 	mustn't I be suffocating?
mustn't you be suffocating?
mustn't she be suffocating?
mustn't we be suffocating?
mustn't you be suffocating?
mustn't they be suffocating? 	mustn't I have suffocated?
mustn't you have suffocated?
mustn't she have suffocated?
mustn't we have suffocated?
mustn't you have suffocated?
mustn't they have suffocated? 	mustn't I have been suffocating?
mustn't you have been suffocating?
mustn't she have been suffocating?
mustn't we have been suffocating?
mustn't you have been suffocating?
mustn't they have been suffocating?