must drill
Regular verb: drill - drilled- drilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must drill
you must drill
he must drill
we must drill
you must drill
they must drill 	I must be drilling
you must be drilling
he must be drilling
we must be drilling
you must be drilling
they must be drilling	I must have drilled
you must have drilled
he must have drilled
we must have drilled
you must have drilled
they must have drilled	I must have been drilling
you must have been drilling
he must have been drilling
we must have been drilling
you must have been drilling
they must have been drilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not drill
you must not drill
he must not drill
we must not drill
you must not drill
they must not drill 	I must not be drilling
you must not be drilling
he must not be drilling
we must not be drilling
you must not be drilling
they must not be drilling	I must not have drilled
you must not have drilled
he must not have drilled
we must not have drilled
you must not have drilled
they must not have drilled	I must not have been drilling
you must not have been drilling
he must not have been drilling
we must not have been drilling
you must not have been drilling
they must not have been drilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I drill?
must you drill?
must he drill?
must we drill?
must you drill?
must they drill? 	must I be drilling?
must you be drilling?
must he be drilling?
must we be drilling?
must you be drilling?
must they be drilling? 	must I have drilled?
must you have drilled?
must he have drilled?
must we have drilled?
must you have drilled?
must they have drilled? 	must I have been drilling?
must you have been drilling?
must he have been drilling?
must we have been drilling?
must you have been drilling?
must they have been drilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not drill?
must you not drill?
must he not drill?
must we not drill?
must you not drill?
must they not drill? 	must I not be drilling?
must you not be drilling?
must he not be drilling?
must we not be drilling?
must you not be drilling?
must they not be drilling? 	must I not have drilled?
must you not have drilled?
must he not have drilled?
must we not have drilled?
must you not have drilled?
must they not have drilled? 	must I not have been drilling?
must you not have been drilling?
must he not have been drilling?
must we not have been drilling?
must you not have been drilling?
must they not have been drilling?