must chunk
Regular verb: chunk - chunked- chunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must chunk
you must chunk
she must chunk
we must chunk
you must chunk
they must chunk 	I must be chunking
you must be chunking
she must be chunking
we must be chunking
you must be chunking
they must be chunking	I must have chunked
you must have chunked
she must have chunked
we must have chunked
you must have chunked
they must have chunked	I must have been chunking
you must have been chunking
she must have been chunking
we must have been chunking
you must have been chunking
they must have been chunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't chunk
you mustn't chunk
she mustn't chunk
we mustn't chunk
you mustn't chunk
they mustn't chunk 	I mustn't be chunking
you mustn't be chunking
she mustn't be chunking
we mustn't be chunking
you mustn't be chunking
they mustn't be chunking	I mustn't have chunked
you mustn't have chunked
she mustn't have chunked
we mustn't have chunked
you mustn't have chunked
they mustn't have chunked	I mustn't have been chunking
you mustn't have been chunking
she mustn't have been chunking
we mustn't have been chunking
you mustn't have been chunking
they mustn't have been chunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I chunk?
must you chunk?
must she chunk?
must we chunk?
must you chunk?
must they chunk? 	must I be chunking?
must you be chunking?
must she be chunking?
must we be chunking?
must you be chunking?
must they be chunking? 	must I have chunked?
must you have chunked?
must she have chunked?
must we have chunked?
must you have chunked?
must they have chunked? 	must I have been chunking?
must you have been chunking?
must she have been chunking?
must we have been chunking?
must you have been chunking?
must they have been chunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I chunk?
mustn't you chunk?
mustn't she chunk?
mustn't we chunk?
mustn't you chunk?
mustn't they chunk? 	mustn't I be chunking?
mustn't you be chunking?
mustn't she be chunking?
mustn't we be chunking?
mustn't you be chunking?
mustn't they be chunking? 	mustn't I have chunked?
mustn't you have chunked?
mustn't she have chunked?
mustn't we have chunked?
mustn't you have chunked?
mustn't they have chunked? 	mustn't I have been chunking?
mustn't you have been chunking?
mustn't she have been chunking?
mustn't we have been chunking?
mustn't you have been chunking?
mustn't they have been chunking?