English verb conjugation
COULD SIPHON

Regular verb: siphon - siphoned - siphoned

Affirmation

Simple form	V-ing form
I could siphon you could siphon he could siphon we could siphon you could siphon they could siphon	I could be siphoning you could be siphoning he could be siphoning we could be siphoning you could be siphoning they could be siphoning
Perfect	V-ing perfect
I could have siphoned you could have siphoned he could have siphoned we could have siphoned you could have siphoned they could have siphoned	I could have been siphoning you could have been siphoning he could have been siphoning we could have been siphoning you could have been siphoning they could have been siphoning

Negation

Simple form	V-ing form
I couldn't siphon you couldn't siphon he couldn't siphon we couldn't siphon you couldn't siphon they couldn't siphon	I couldn't be siphoning you couldn't be siphoning he couldn't be siphoning we couldn't be siphoning you couldn't be siphoning they couldn't be siphoning
Perfect	V-ing perfect
I couldn't have siphoned you couldn't have siphoned he couldn't have siphoned we couldn't have siphoned you couldn't have siphoned they couldn't have siphoned	I couldn't have been siphoning you couldn't have been siphoning he couldn't have been siphoning we couldn't have been siphoning you couldn't have been siphoning they couldn't have been siphoning

Interrogative form

Simple form	V-ing form
could I siphon? could you siphon? could he siphon? could we siphon? could you siphon? could they siphon?	could I be siphoning? could you be siphoning? could he be siphoning? could we be siphoning? could you be siphoning? could they be siphoning?
Perfect	V-ing perfect
could I have siphoned? could you have siphoned? could he have siphoned? could we have siphoned? could you have siphoned? could they have siphoned?	could I have been siphoning? could you have been siphoning? could he have been siphoning? could we have been siphoning? could you have been siphoning? could they have been siphoning?

Interro-negative form

Simple form	V-ing form
couldn't I siphon? couldn't you siphon? couldn't he siphon? couldn't we siphon? couldn't you siphon? couldn't they siphon?	couldn't I be siphoning? couldn't you be siphoning? couldn't he be siphoning? couldn't we be siphoning? couldn't you be siphoning? couldn't they be siphoning?
Perfect	V-ing perfect
couldn't I have siphoned? couldn't you have siphoned? couldn't he have siphoned? couldn't we have siphoned? couldn't you have siphoned? couldn't they have siphoned?	couldn't I have been siphoning? couldn't you have been siphoning? couldn't he have been siphoning? couldn't we have been siphoning? couldn't you have been siphoning? couldn't they have been siphoning?