can practice
Regular verb: practice - practiced- practiced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can practice
you can practice
he can practice
we can practice
you can practice
they can practice 	I can be practicing
you can be practicing
he can be practicing
we can be practicing
you can be practicing
they can be practicing	I can have practiced
you can have practiced
he can have practiced
we can have practiced
you can have practiced
they can have practiced	I can have been practicing
you can have been practicing
he can have been practicing
we can have been practicing
you can have been practicing
they can have been practicing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot practice
you cannot practice
he cannot practice
we cannot practice
you cannot practice
they cannot practice 	I cannot be practicing
you cannot be practicing
he cannot be practicing
we cannot be practicing
you cannot be practicing
they cannot be practicing	I cannot have practiced
you cannot have practiced
he cannot have practiced
we cannot have practiced
you cannot have practiced
they cannot have practiced	I cannot have been practicing
you cannot have been practicing
he cannot have been practicing
we cannot have been practicing
you cannot have been practicing
they cannot have been practicing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I practice?
can you practice?
can he practice?
can we practice?
can you practice?
can they practice? 	can I be practicing?
can you be practicing?
can he be practicing?
can we be practicing?
can you be practicing?
can they be practicing? 	can I have practiced?
can you have practiced?
can he have practiced?
can we have practiced?
can you have practiced?
can they have practiced? 	can I have been practicing?
can you have been practicing?
can he have been practicing?
can we have been practicing?
can you have been practicing?
can they have been practicing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not practice?
can you not practice?
can he not practice?
can we not practice?
can you not practice?
can they not practice? 	can I not be practicing?
can you not be practicing?
can he not be practicing?
can we not be practicing?
can you not be practicing?
can they not be practicing? 	can I not have practiced?
can you not have practiced?
can he not have practiced?
can we not have practiced?
can you not have practiced?
can they not have practiced? 	can I not have been practicing?
can you not have been practicing?
can he not have been practicing?
can we not have been practicing?
can you not have been practicing?
can they not have been practicing?