English verb conjugation
CAN THWACK

Regular verb: thwack - thwacked - thwacked

Affirmation

Simple form	V-ing form
I can thwack you can thwack he can thwack we can thwack you can thwack they can thwack	I can be thwacking you can be thwacking he can be thwacking we can be thwacking you can be thwacking they can be thwacking
Perfect	V-ing perfect
I can have thwacked you can have thwacked he can have thwacked we can have thwacked you can have thwacked they can have thwacked	I can have been thwacking you can have been thwacking he can have been thwacking we can have been thwacking you can have been thwacking they can have been thwacking

Negation

Simple form	V-ing form
I cannot thwack you cannot thwack he cannot thwack we cannot thwack you cannot thwack they cannot thwack	I cannot be thwacking you cannot be thwacking he cannot be thwacking we cannot be thwacking you cannot be thwacking they cannot be thwacking
Perfect	V-ing perfect
I cannot have thwacked you cannot have thwacked he cannot have thwacked we cannot have thwacked you cannot have thwacked they cannot have thwacked	I cannot have been thwacking you cannot have been thwacking he cannot have been thwacking we cannot have been thwacking you cannot have been thwacking they cannot have been thwacking

Interrogative form

Simple form	V-ing form
can I thwack? can you thwack? can he thwack? can we thwack? can you thwack? can they thwack?	can I be thwacking? can you be thwacking? can he be thwacking? can we be thwacking? can you be thwacking? can they be thwacking?
Perfect	V-ing perfect
can I have thwacked? can you have thwacked? can he have thwacked? can we have thwacked? can you have thwacked? can they have thwacked?	can I have been thwacking? can you have been thwacking? can he have been thwacking? can we have been thwacking? can you have been thwacking? can they have been thwacking?

Interro-negative form

Simple form	V-ing form
can I not thwack? can you not thwack? can he not thwack? can we not thwack? can you not thwack? can they not thwack?	can I not be thwacking? can you not be thwacking? can he not be thwacking? can we not be thwacking? can you not be thwacking? can they not be thwacking?
Perfect	V-ing perfect
can I not have thwacked? can you not have thwacked? can he not have thwacked? can we not have thwacked? can you not have thwacked? can they not have thwacked?	can I not have been thwacking? can you not have been thwacking? can he not have been thwacking? can we not have been thwacking? can you not have been thwacking? can they not have been thwacking?