must collect
Regular verb: collect - collected- collected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must collect
you must collect
he must collect
we must collect
you must collect
they must collect 	I must be collecting
you must be collecting
he must be collecting
we must be collecting
you must be collecting
they must be collecting	I must have collected
you must have collected
he must have collected
we must have collected
you must have collected
they must have collected	I must have been collecting
you must have been collecting
he must have been collecting
we must have been collecting
you must have been collecting
they must have been collecting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't collect
you mustn't collect
he mustn't collect
we mustn't collect
you mustn't collect
they mustn't collect 	I mustn't be collecting
you mustn't be collecting
he mustn't be collecting
we mustn't be collecting
you mustn't be collecting
they mustn't be collecting	I mustn't have collected
you mustn't have collected
he mustn't have collected
we mustn't have collected
you mustn't have collected
they mustn't have collected	I mustn't have been collecting
you mustn't have been collecting
he mustn't have been collecting
we mustn't have been collecting
you mustn't have been collecting
they mustn't have been collecting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I collect?
must you collect?
must he collect?
must we collect?
must you collect?
must they collect? 	must I be collecting?
must you be collecting?
must he be collecting?
must we be collecting?
must you be collecting?
must they be collecting? 	must I have collected?
must you have collected?
must he have collected?
must we have collected?
must you have collected?
must they have collected? 	must I have been collecting?
must you have been collecting?
must he have been collecting?
must we have been collecting?
must you have been collecting?
must they have been collecting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I collect?
mustn't you collect?
mustn't he collect?
mustn't we collect?
mustn't you collect?
mustn't they collect? 	mustn't I be collecting?
mustn't you be collecting?
mustn't he be collecting?
mustn't we be collecting?
mustn't you be collecting?
mustn't they be collecting? 	mustn't I have collected?
mustn't you have collected?
mustn't he have collected?
mustn't we have collected?
mustn't you have collected?
mustn't they have collected? 	mustn't I have been collecting?
mustn't you have been collecting?
mustn't he have been collecting?
mustn't we have been collecting?
mustn't you have been collecting?
mustn't they have been collecting?