English verb conjugation
CAN PRACTICE

Regular verb: practice - practiced - practiced

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?