can throb
Regular verb: throb - throbbed- throbbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can throb
you can throb
she can throb
we can throb
you can throb
they can throb 	I can be throbbing
you can be throbbing
she can be throbbing
we can be throbbing
you can be throbbing
they can be throbbing	I can have throbbed
you can have throbbed
she can have throbbed
we can have throbbed
you can have throbbed
they can have throbbed	I can have been throbbing
you can have been throbbing
she can have been throbbing
we can have been throbbing
you can have been throbbing
they can have been throbbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot throb
you cannot throb
she cannot throb
we cannot throb
you cannot throb
they cannot throb 	I cannot be throbbing
you cannot be throbbing
she cannot be throbbing
we cannot be throbbing
you cannot be throbbing
they cannot be throbbing	I cannot have throbbed
you cannot have throbbed
she cannot have throbbed
we cannot have throbbed
you cannot have throbbed
they cannot have throbbed	I cannot have been throbbing
you cannot have been throbbing
she cannot have been throbbing
we cannot have been throbbing
you cannot have been throbbing
they cannot have been throbbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I throb?
can you throb?
can she throb?
can we throb?
can you throb?
can they throb? 	can I be throbbing?
can you be throbbing?
can she be throbbing?
can we be throbbing?
can you be throbbing?
can they be throbbing? 	can I have throbbed?
can you have throbbed?
can she have throbbed?
can we have throbbed?
can you have throbbed?
can they have throbbed? 	can I have been throbbing?
can you have been throbbing?
can she have been throbbing?
can we have been throbbing?
can you have been throbbing?
can they have been throbbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not throb?
can you not throb?
can she not throb?
can we not throb?
can you not throb?
can they not throb? 	can I not be throbbing?
can you not be throbbing?
can she not be throbbing?
can we not be throbbing?
can you not be throbbing?
can they not be throbbing? 	can I not have throbbed?
can you not have throbbed?
can she not have throbbed?
can we not have throbbed?
can you not have throbbed?
can they not have throbbed? 	can I not have been throbbing?
can you not have been throbbing?
can she not have been throbbing?
can we not have been throbbing?
can you not have been throbbing?
can they not have been throbbing?