English verb conjugation
COULD PIPET

Regular verb: pipet - pipeted - pipeted

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't pipet you couldn't pipet he couldn't pipet we couldn't pipet you couldn't pipet they couldn't pipet	I couldn't be pipeting you couldn't be pipeting he couldn't be pipeting we couldn't be pipeting you couldn't be pipeting they couldn't be pipeting
Perfect	V-ing perfect
I couldn't have pipeted you couldn't have pipeted he couldn't have pipeted we couldn't have pipeted you couldn't have pipeted they couldn't have pipeted	I couldn't have been pipeting you couldn't have been pipeting he couldn't have been pipeting we couldn't have been pipeting you couldn't have been pipeting they couldn't have been pipeting

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I pipet? couldn't you pipet? couldn't he pipet? couldn't we pipet? couldn't you pipet? couldn't they pipet?	couldn't I be pipeting? couldn't you be pipeting? couldn't he be pipeting? couldn't we be pipeting? couldn't you be pipeting? couldn't they be pipeting?
Perfect	V-ing perfect
couldn't I have pipeted? couldn't you have pipeted? couldn't he have pipeted? couldn't we have pipeted? couldn't you have pipeted? couldn't they have pipeted?	couldn't I have been pipeting? couldn't you have been pipeting? couldn't he have been pipeting? couldn't we have been pipeting? couldn't you have been pipeting? couldn't they have been pipeting?