can thread
Regular verb: thread - threaded- threaded

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