English verb conjugation
CAN ITCH

Regular verb: itch - itched - itched

Affirmation

Simple form	V-ing form
I can itch you can itch she can itch we can itch you can itch they can itch	I can be itching you can be itching she can be itching we can be itching you can be itching they can be itching
Perfect	V-ing perfect
I can have itched you can have itched she can have itched we can have itched you can have itched they can have itched	I can have been itching you can have been itching she can have been itching we can have been itching you can have been itching they can have been itching

Negation

Simple form	V-ing form
I can't itch you can't itch she can't itch we can't itch you can't itch they can't itch	I can't be itching you can't be itching she can't be itching we can't be itching you can't be itching they can't be itching
Perfect	V-ing perfect
I can't have itched you can't have itched she can't have itched we can't have itched you can't have itched they can't have itched	I can't have been itching you can't have been itching she can't have been itching we can't have been itching you can't have been itching they can't have been itching

Interrogative form

Simple form	V-ing form
can I itch? can you itch? can she itch? can we itch? can you itch? can they itch?	can I be itching? can you be itching? can she be itching? can we be itching? can you be itching? can they be itching?
Perfect	V-ing perfect
can I have itched? can you have itched? can she have itched? can we have itched? can you have itched? can they have itched?	can I have been itching? can you have been itching? can she have been itching? can we have been itching? can you have been itching? can they have been itching?

Interro-negative form

Simple form	V-ing form
can't I itch? can't you itch? can't she itch? can't we itch? can't you itch? can't they itch?	can't I be itching? can't you be itching? can't she be itching? can't we be itching? can't you be itching? can't they be itching?
Perfect	V-ing perfect
can't I have itched? can't you have itched? can't she have itched? can't we have itched? can't you have itched? can't they have itched?	can't I have been itching? can't you have been itching? can't she have been itching? can't we have been itching? can't you have been itching? can't they have been itching?