English verb conjugation
COULD PONDER

Regular verb: ponder - pondered - pondered

Affirmation

Simple form	V-ing form
I could ponder you could ponder she could ponder we could ponder you could ponder they could ponder	I could be pondering you could be pondering she could be pondering we could be pondering you could be pondering they could be pondering
Perfect	V-ing perfect
I could have pondered you could have pondered she could have pondered we could have pondered you could have pondered they could have pondered	I could have been pondering you could have been pondering she could have been pondering we could have been pondering you could have been pondering they could have been pondering

Negation

Simple form	V-ing form
I could not ponder you could not ponder she could not ponder we could not ponder you could not ponder they could not ponder	I could not be pondering you could not be pondering she could not be pondering we could not be pondering you could not be pondering they could not be pondering
Perfect	V-ing perfect
I could not have pondered you could not have pondered she could not have pondered we could not have pondered you could not have pondered they could not have pondered	I could not have been pondering you could not have been pondering she could not have been pondering we could not have been pondering you could not have been pondering they could not have been pondering

Interrogative form

Simple form	V-ing form
could I ponder? could you ponder? could she ponder? could we ponder? could you ponder? could they ponder?	could I be pondering? could you be pondering? could she be pondering? could we be pondering? could you be pondering? could they be pondering?
Perfect	V-ing perfect
could I have pondered? could you have pondered? could she have pondered? could we have pondered? could you have pondered? could they have pondered?	could I have been pondering? could you have been pondering? could she have been pondering? could we have been pondering? could you have been pondering? could they have been pondering?

Interro-negative form

Simple form	V-ing form
could I not ponder? could you not ponder? could she not ponder? could we not ponder? could you not ponder? could they not ponder?	could I not be pondering? could you not be pondering? could she not be pondering? could we not be pondering? could you not be pondering? could they not be pondering?
Perfect	V-ing perfect
could I not have pondered? could you not have pondered? could she not have pondered? could we not have pondered? could you not have pondered? could they not have pondered?	could I not have been pondering? could you not have been pondering? could she not have been pondering? could we not have been pondering? could you not have been pondering? could they not have been pondering?