must stall
Regular verb: stall - stalled- stalled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stall
you must stall
she must stall
we must stall
you must stall
they must stall 	I must be stalling
you must be stalling
she must be stalling
we must be stalling
you must be stalling
they must be stalling	I must have stalled
you must have stalled
she must have stalled
we must have stalled
you must have stalled
they must have stalled	I must have been stalling
you must have been stalling
she must have been stalling
we must have been stalling
you must have been stalling
they must have been stalling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stall
you must not stall
she must not stall
we must not stall
you must not stall
they must not stall 	I must not be stalling
you must not be stalling
she must not be stalling
we must not be stalling
you must not be stalling
they must not be stalling	I must not have stalled
you must not have stalled
she must not have stalled
we must not have stalled
you must not have stalled
they must not have stalled	I must not have been stalling
you must not have been stalling
she must not have been stalling
we must not have been stalling
you must not have been stalling
they must not have been stalling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stall?
must you stall?
must she stall?
must we stall?
must you stall?
must they stall? 	must I be stalling?
must you be stalling?
must she be stalling?
must we be stalling?
must you be stalling?
must they be stalling? 	must I have stalled?
must you have stalled?
must she have stalled?
must we have stalled?
must you have stalled?
must they have stalled? 	must I have been stalling?
must you have been stalling?
must she have been stalling?
must we have been stalling?
must you have been stalling?
must they have been stalling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stall?
must you not stall?
must she not stall?
must we not stall?
must you not stall?
must they not stall? 	must I not be stalling?
must you not be stalling?
must she not be stalling?
must we not be stalling?
must you not be stalling?
must they not be stalling? 	must I not have stalled?
must you not have stalled?
must she not have stalled?
must we not have stalled?
must you not have stalled?
must they not have stalled? 	must I not have been stalling?
must you not have been stalling?
must she not have been stalling?
must we not have been stalling?
must you not have been stalling?
must they not have been stalling?