could pipette
Regular verb: pipette - pipetted- pipetted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pipette
you could pipette
she could pipette
we could pipette
you could pipette
they could pipette 	I could be pipetting
you could be pipetting
she could be pipetting
we could be pipetting
you could be pipetting
they could be pipetting	I could have pipetted
you could have pipetted
she could have pipetted
we could have pipetted
you could have pipetted
they could have pipetted	I could have been pipetting
you could have been pipetting
she could have been pipetting
we could have been pipetting
you could have been pipetting
they could have been pipetting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pipette
you couldn't pipette
she couldn't pipette
we couldn't pipette
you couldn't pipette
they couldn't pipette 	I couldn't be pipetting
you couldn't be pipetting
she couldn't be pipetting
we couldn't be pipetting
you couldn't be pipetting
they couldn't be pipetting	I couldn't have pipetted
you couldn't have pipetted
she couldn't have pipetted
we couldn't have pipetted
you couldn't have pipetted
they couldn't have pipetted	I couldn't have been pipetting
you couldn't have been pipetting
she couldn't have been pipetting
we couldn't have been pipetting
you couldn't have been pipetting
they couldn't have been pipetting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pipette?
could you pipette?
could she pipette?
could we pipette?
could you pipette?
could they pipette? 	could I be pipetting?
could you be pipetting?
could she be pipetting?
could we be pipetting?
could you be pipetting?
could they be pipetting? 	could I have pipetted?
could you have pipetted?
could she have pipetted?
could we have pipetted?
could you have pipetted?
could they have pipetted? 	could I have been pipetting?
could you have been pipetting?
could she have been pipetting?
could we have been pipetting?
could you have been pipetting?
could they have been pipetting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pipette?
couldn't you pipette?
couldn't she pipette?
couldn't we pipette?
couldn't you pipette?
couldn't they pipette? 	couldn't I be pipetting?
couldn't you be pipetting?
couldn't she be pipetting?
couldn't we be pipetting?
couldn't you be pipetting?
couldn't they be pipetting? 	couldn't I have pipetted?
couldn't you have pipetted?
couldn't she have pipetted?
couldn't we have pipetted?
couldn't you have pipetted?
couldn't they have pipetted? 	couldn't I have been pipetting?
couldn't you have been pipetting?
couldn't she have been pipetting?
couldn't we have been pipetting?
couldn't you have been pipetting?
couldn't they have been pipetting?