English verb conjugation
COULD PIPETTE

Regular verb: pipette - pipetted - pipetted

Affirmation

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