could pipet
Regular verb: pipet - pipeted- pipeted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pipet
you could pipet
he could pipet
we could pipet
you could pipet
they could pipet 	I could be pipeting
you could be pipeting
he could be pipeting
we could be pipeting
you could be pipeting
they could be pipeting	I could have pipeted
you could have pipeted
he could have pipeted
we could have pipeted
you could have pipeted
they could have pipeted	I could have been pipeting
you could have been pipeting
he could have been pipeting
we could have been pipeting
you could have been pipeting
they could have been pipeting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not pipet
you could not pipet
he could not pipet
we could not pipet
you could not pipet
they could not pipet 	I could not be pipeting
you could not be pipeting
he could not be pipeting
we could not be pipeting
you could not be pipeting
they could not be pipeting	I could not have pipeted
you could not have pipeted
he could not have pipeted
we could not have pipeted
you could not have pipeted
they could not have pipeted	I could not have been pipeting
you could not have been pipeting
he could not have been pipeting
we could not have been pipeting
you could not have been pipeting
they could not have been pipeting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pipet?
could you pipet?
could he pipet?
could we pipet?
could you pipet?
could they pipet? 	could I be pipeting?
could you be pipeting?
could he be pipeting?
could we be pipeting?
could you be pipeting?
could they be pipeting? 	could I have pipeted?
could you have pipeted?
could he have pipeted?
could we have pipeted?
could you have pipeted?
could they have pipeted? 	could I have been pipeting?
could you have been pipeting?
could he have been pipeting?
could we have been pipeting?
could you have been pipeting?
could they have been pipeting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not pipet?
could you not pipet?
could he not pipet?
could we not pipet?
could you not pipet?
could they not pipet? 	could I not be pipeting?
could you not be pipeting?
could he not be pipeting?
could we not be pipeting?
could you not be pipeting?
could they not be pipeting? 	could I not have pipeted?
could you not have pipeted?
could he not have pipeted?
could we not have pipeted?
could you not have pipeted?
could they not have pipeted? 	could I not have been pipeting?
could you not have been pipeting?
could he not have been pipeting?
could we not have been pipeting?
could you not have been pipeting?
could they not have been pipeting?