can vacillate
Regular verb: vacillate - vacillated- vacillated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can vacillate
you can vacillate
he can vacillate
we can vacillate
you can vacillate
they can vacillate 	I can be vacillating
you can be vacillating
he can be vacillating
we can be vacillating
you can be vacillating
they can be vacillating	I can have vacillated
you can have vacillated
he can have vacillated
we can have vacillated
you can have vacillated
they can have vacillated	I can have been vacillating
you can have been vacillating
he can have been vacillating
we can have been vacillating
you can have been vacillating
they can have been vacillating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot vacillate
you cannot vacillate
he cannot vacillate
we cannot vacillate
you cannot vacillate
they cannot vacillate 	I cannot be vacillating
you cannot be vacillating
he cannot be vacillating
we cannot be vacillating
you cannot be vacillating
they cannot be vacillating	I cannot have vacillated
you cannot have vacillated
he cannot have vacillated
we cannot have vacillated
you cannot have vacillated
they cannot have vacillated	I cannot have been vacillating
you cannot have been vacillating
he cannot have been vacillating
we cannot have been vacillating
you cannot have been vacillating
they cannot have been vacillating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I vacillate?
can you vacillate?
can he vacillate?
can we vacillate?
can you vacillate?
can they vacillate? 	can I be vacillating?
can you be vacillating?
can he be vacillating?
can we be vacillating?
can you be vacillating?
can they be vacillating? 	can I have vacillated?
can you have vacillated?
can he have vacillated?
can we have vacillated?
can you have vacillated?
can they have vacillated? 	can I have been vacillating?
can you have been vacillating?
can he have been vacillating?
can we have been vacillating?
can you have been vacillating?
can they have been vacillating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not vacillate?
can you not vacillate?
can he not vacillate?
can we not vacillate?
can you not vacillate?
can they not vacillate? 	can I not be vacillating?
can you not be vacillating?
can he not be vacillating?
can we not be vacillating?
can you not be vacillating?
can they not be vacillating? 	can I not have vacillated?
can you not have vacillated?
can he not have vacillated?
can we not have vacillated?
can you not have vacillated?
can they not have vacillated? 	can I not have been vacillating?
can you not have been vacillating?
can he not have been vacillating?
can we not have been vacillating?
can you not have been vacillating?
can they not have been vacillating?