English verb conjugation
COULD PREOBTAIN

Regular verb: preobtain - preobtained - preobtained

Affirmation

Simple form	V-ing form
I could preobtain you could preobtain she could preobtain we could preobtain you could preobtain they could preobtain	I could be preobtaining you could be preobtaining she could be preobtaining we could be preobtaining you could be preobtaining they could be preobtaining
Perfect	V-ing perfect
I could have preobtained you could have preobtained she could have preobtained we could have preobtained you could have preobtained they could have preobtained	I could have been preobtaining you could have been preobtaining she could have been preobtaining we could have been preobtaining you could have been preobtaining they could have been preobtaining

Negation

Simple form	V-ing form
I couldn't preobtain you couldn't preobtain she couldn't preobtain we couldn't preobtain you couldn't preobtain they couldn't preobtain	I couldn't be preobtaining you couldn't be preobtaining she couldn't be preobtaining we couldn't be preobtaining you couldn't be preobtaining they couldn't be preobtaining
Perfect	V-ing perfect
I couldn't have preobtained you couldn't have preobtained she couldn't have preobtained we couldn't have preobtained you couldn't have preobtained they couldn't have preobtained	I couldn't have been preobtaining you couldn't have been preobtaining she couldn't have been preobtaining we couldn't have been preobtaining you couldn't have been preobtaining they couldn't have been preobtaining

Interrogative form

Simple form	V-ing form
could I preobtain? could you preobtain? could she preobtain? could we preobtain? could you preobtain? could they preobtain?	could I be preobtaining? could you be preobtaining? could she be preobtaining? could we be preobtaining? could you be preobtaining? could they be preobtaining?
Perfect	V-ing perfect
could I have preobtained? could you have preobtained? could she have preobtained? could we have preobtained? could you have preobtained? could they have preobtained?	could I have been preobtaining? could you have been preobtaining? could she have been preobtaining? could we have been preobtaining? could you have been preobtaining? could they have been preobtaining?

Interro-negative form

Simple form	V-ing form
couldn't I preobtain? couldn't you preobtain? couldn't she preobtain? couldn't we preobtain? couldn't you preobtain? couldn't they preobtain?	couldn't I be preobtaining? couldn't you be preobtaining? couldn't she be preobtaining? couldn't we be preobtaining? couldn't you be preobtaining? couldn't they be preobtaining?
Perfect	V-ing perfect
couldn't I have preobtained? couldn't you have preobtained? couldn't she have preobtained? couldn't we have preobtained? couldn't you have preobtained? couldn't they have preobtained?	couldn't I have been preobtaining? couldn't you have been preobtaining? couldn't she have been preobtaining? couldn't we have been preobtaining? couldn't you have been preobtaining? couldn't they have been preobtaining?