English verb conjugation
COULD PONDER

Regular verb: ponder - pondered - pondered

Affirmation

Simple form	V-ing form
I could ponder you could ponder he could ponder we could ponder you could ponder they could ponder	I could be pondering you could be pondering he 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 he 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 he 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 couldn't ponder you couldn't ponder he couldn't ponder we couldn't ponder you couldn't ponder they couldn't ponder	I couldn't be pondering you couldn't be pondering he couldn't be pondering we couldn't be pondering you couldn't be pondering they couldn't be pondering
Perfect	V-ing perfect
I couldn't have pondered you couldn't have pondered he couldn't have pondered we couldn't have pondered you couldn't have pondered they couldn't have pondered	I couldn't have been pondering you couldn't have been pondering he couldn't have been pondering we couldn't have been pondering you couldn't have been pondering they couldn't have been pondering

Interrogative form

Simple form	V-ing form
could I ponder? could you ponder? could he ponder? could we ponder? could you ponder? could they ponder?	could I be pondering? could you be pondering? could he 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 he 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 he 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
couldn't I ponder? couldn't you ponder? couldn't he ponder? couldn't we ponder? couldn't you ponder? couldn't they ponder?	couldn't I be pondering? couldn't you be pondering? couldn't he be pondering? couldn't we be pondering? couldn't you be pondering? couldn't they be pondering?
Perfect	V-ing perfect
couldn't I have pondered? couldn't you have pondered? couldn't he have pondered? couldn't we have pondered? couldn't you have pondered? couldn't they have pondered?	couldn't I have been pondering? couldn't you have been pondering? couldn't he have been pondering? couldn't we have been pondering? couldn't you have been pondering? couldn't they have been pondering?