must collaborate
Regular verb: collaborate - collaborated- collaborated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must collaborate
you must collaborate
he must collaborate
we must collaborate
you must collaborate
they must collaborate 	I must be collaborating
you must be collaborating
he must be collaborating
we must be collaborating
you must be collaborating
they must be collaborating	I must have collaborated
you must have collaborated
he must have collaborated
we must have collaborated
you must have collaborated
they must have collaborated	I must have been collaborating
you must have been collaborating
he must have been collaborating
we must have been collaborating
you must have been collaborating
they must have been collaborating	

Negation 	
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I mustn't collaborate
you mustn't collaborate
he mustn't collaborate
we mustn't collaborate
you mustn't collaborate
they mustn't collaborate 	I mustn't be collaborating
you mustn't be collaborating
he mustn't be collaborating
we mustn't be collaborating
you mustn't be collaborating
they mustn't be collaborating	I mustn't have collaborated
you mustn't have collaborated
he mustn't have collaborated
we mustn't have collaborated
you mustn't have collaborated
they mustn't have collaborated	I mustn't have been collaborating
you mustn't have been collaborating
he mustn't have been collaborating
we mustn't have been collaborating
you mustn't have been collaborating
they mustn't have been collaborating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I collaborate?
must you collaborate?
must he collaborate?
must we collaborate?
must you collaborate?
must they collaborate? 	must I be collaborating?
must you be collaborating?
must he be collaborating?
must we be collaborating?
must you be collaborating?
must they be collaborating? 	must I have collaborated?
must you have collaborated?
must he have collaborated?
must we have collaborated?
must you have collaborated?
must they have collaborated? 	must I have been collaborating?
must you have been collaborating?
must he have been collaborating?
must we have been collaborating?
must you have been collaborating?
must they have been collaborating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I collaborate?
mustn't you collaborate?
mustn't he collaborate?
mustn't we collaborate?
mustn't you collaborate?
mustn't they collaborate? 	mustn't I be collaborating?
mustn't you be collaborating?
mustn't he be collaborating?
mustn't we be collaborating?
mustn't you be collaborating?
mustn't they be collaborating? 	mustn't I have collaborated?
mustn't you have collaborated?
mustn't he have collaborated?
mustn't we have collaborated?
mustn't you have collaborated?
mustn't they have collaborated? 	mustn't I have been collaborating?
mustn't you have been collaborating?
mustn't he have been collaborating?
mustn't we have been collaborating?
mustn't you have been collaborating?
mustn't they have been collaborating?