can pierce
Regular verb: pierce - pierced- pierced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can pierce
you can pierce
she can pierce
we can pierce
you can pierce
they can pierce 	I can be piercing
you can be piercing
she can be piercing
we can be piercing
you can be piercing
they can be piercing	I can have pierced
you can have pierced
she can have pierced
we can have pierced
you can have pierced
they can have pierced	I can have been piercing
you can have been piercing
she can have been piercing
we can have been piercing
you can have been piercing
they can have been piercing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't pierce
you can't pierce
she can't pierce
we can't pierce
you can't pierce
they can't pierce 	I can't be piercing
you can't be piercing
she can't be piercing
we can't be piercing
you can't be piercing
they can't be piercing	I can't have pierced
you can't have pierced
she can't have pierced
we can't have pierced
you can't have pierced
they can't have pierced	I can't have been piercing
you can't have been piercing
she can't have been piercing
we can't have been piercing
you can't have been piercing
they can't have been piercing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I pierce?
can you pierce?
can she pierce?
can we pierce?
can you pierce?
can they pierce? 	can I be piercing?
can you be piercing?
can she be piercing?
can we be piercing?
can you be piercing?
can they be piercing? 	can I have pierced?
can you have pierced?
can she have pierced?
can we have pierced?
can you have pierced?
can they have pierced? 	can I have been piercing?
can you have been piercing?
can she have been piercing?
can we have been piercing?
can you have been piercing?
can they have been piercing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I pierce?
can't you pierce?
can't she pierce?
can't we pierce?
can't you pierce?
can't they pierce? 	can't I be piercing?
can't you be piercing?
can't she be piercing?
can't we be piercing?
can't you be piercing?
can't they be piercing? 	can't I have pierced?
can't you have pierced?
can't she have pierced?
can't we have pierced?
can't you have pierced?
can't they have pierced? 	can't I have been piercing?
can't you have been piercing?
can't she have been piercing?
can't we have been piercing?
can't you have been piercing?
can't they have been piercing?