must nip
Regular verb: nip - nipped- nipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must nip
you must nip
she must nip
we must nip
you must nip
they must nip 	I must be nipping
you must be nipping
she must be nipping
we must be nipping
you must be nipping
they must be nipping	I must have nipped
you must have nipped
she must have nipped
we must have nipped
you must have nipped
they must have nipped	I must have been nipping
you must have been nipping
she must have been nipping
we must have been nipping
you must have been nipping
they must have been nipping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't nip
you mustn't nip
she mustn't nip
we mustn't nip
you mustn't nip
they mustn't nip 	I mustn't be nipping
you mustn't be nipping
she mustn't be nipping
we mustn't be nipping
you mustn't be nipping
they mustn't be nipping	I mustn't have nipped
you mustn't have nipped
she mustn't have nipped
we mustn't have nipped
you mustn't have nipped
they mustn't have nipped	I mustn't have been nipping
you mustn't have been nipping
she mustn't have been nipping
we mustn't have been nipping
you mustn't have been nipping
they mustn't have been nipping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I nip?
must you nip?
must she nip?
must we nip?
must you nip?
must they nip? 	must I be nipping?
must you be nipping?
must she be nipping?
must we be nipping?
must you be nipping?
must they be nipping? 	must I have nipped?
must you have nipped?
must she have nipped?
must we have nipped?
must you have nipped?
must they have nipped? 	must I have been nipping?
must you have been nipping?
must she have been nipping?
must we have been nipping?
must you have been nipping?
must they have been nipping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I nip?
mustn't you nip?
mustn't she nip?
mustn't we nip?
mustn't you nip?
mustn't they nip? 	mustn't I be nipping?
mustn't you be nipping?
mustn't she be nipping?
mustn't we be nipping?
mustn't you be nipping?
mustn't they be nipping? 	mustn't I have nipped?
mustn't you have nipped?
mustn't she have nipped?
mustn't we have nipped?
mustn't you have nipped?
mustn't they have nipped? 	mustn't I have been nipping?
mustn't you have been nipping?
mustn't she have been nipping?
mustn't we have been nipping?
mustn't you have been nipping?
mustn't they have been nipping?