can thread
Regular verb: thread - threaded- threaded

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