English verb conjugation
CAN THREAD

Regular verb: thread - threaded - threaded

Affirmation

Simple form	V-ing form
I can thread you can thread he can thread we can thread you can thread they can thread	I can be threading you can be threading he can be threading we can be threading you can be threading they can be threading
Perfect	V-ing perfect
I can have threaded you can have threaded he can have threaded we can have threaded you can have threaded they can have threaded	I can have been threading you can have been threading he can have been threading we can have been threading you can have been threading they can have been threading

Negation

Simple form	V-ing form
I can't thread you can't thread he can't thread we can't thread you can't thread they can't thread	I can't be threading you can't be threading he can't be threading we can't be threading you can't be threading they can't be threading
Perfect	V-ing perfect
I can't have threaded you can't have threaded he can't have threaded we can't have threaded you can't have threaded they can't have threaded	I can't have been threading you can't have been threading he can't have been threading we can't have been threading you can't have been threading they can't have been threading

Interrogative form

Simple form	V-ing form
can I thread? can you thread? can he thread? can we thread? can you thread? can they thread?	can I be threading? can you be threading? can he be threading? can we be threading? can you be threading? can they be threading?
Perfect	V-ing perfect
can I have threaded? can you have threaded? can he have threaded? can we have threaded? can you have threaded? can they have threaded?	can I have been threading? can you have been threading? can he have been threading? can we have been threading? can you have been threading? can they have been threading?

Interro-negative form

Simple form	V-ing form
can't I thread? can't you thread? can't he thread? can't we thread? can't you thread? can't they thread?	can't I be threading? can't you be threading? can't he be threading? can't we be threading? can't you be threading? can't they be threading?
Perfect	V-ing perfect
can't I have threaded? can't you have threaded? can't he have threaded? can't we have threaded? can't you have threaded? can't they have threaded?	can't I have been threading? can't you have been threading? can't he have been threading? can't we have been threading? can't you have been threading? can't they have been threading?