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 cannot thread
you cannot thread
she cannot thread
we cannot thread
you cannot thread
they cannot thread 	I cannot be threading
you cannot be threading
she cannot be threading
we cannot be threading
you cannot be threading
they cannot be threading	I cannot have threaded
you cannot have threaded
she cannot have threaded
we cannot have threaded
you cannot have threaded
they cannot have threaded	I cannot have been threading
you cannot have been threading
she cannot have been threading
we cannot have been threading
you cannot have been threading
they cannot 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 I not thread?
can you not thread?
can she not thread?
can we not thread?
can you not thread?
can they not thread? 	can I not be threading?
can you not be threading?
can she not be threading?
can we not be threading?
can you not be threading?
can they not be threading? 	can I not have threaded?
can you not have threaded?
can she not have threaded?
can we not have threaded?
can you not have threaded?
can they not have threaded? 	can I not have been threading?
can you not have been threading?
can she not have been threading?
can we not have been threading?
can you not have been threading?
can they not have been threading?