could ponder
Regular verb: ponder - pondered- pondered

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