could ping
Regular verb: ping - pinged- pinged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ping
you could ping
she could ping
we could ping
you could ping
they could ping 	I could be pinging
you could be pinging
she could be pinging
we could be pinging
you could be pinging
they could be pinging	I could have pinged
you could have pinged
she could have pinged
we could have pinged
you could have pinged
they could have pinged	I could have been pinging
you could have been pinging
she could have been pinging
we could have been pinging
you could have been pinging
they could have been pinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not ping
you could not ping
she could not ping
we could not ping
you could not ping
they could not ping 	I could not be pinging
you could not be pinging
she could not be pinging
we could not be pinging
you could not be pinging
they could not be pinging	I could not have pinged
you could not have pinged
she could not have pinged
we could not have pinged
you could not have pinged
they could not have pinged	I could not have been pinging
you could not have been pinging
she could not have been pinging
we could not have been pinging
you could not have been pinging
they could not have been pinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I ping?
could you ping?
could she ping?
could we ping?
could you ping?
could they ping? 	could I be pinging?
could you be pinging?
could she be pinging?
could we be pinging?
could you be pinging?
could they be pinging? 	could I have pinged?
could you have pinged?
could she have pinged?
could we have pinged?
could you have pinged?
could they have pinged? 	could I have been pinging?
could you have been pinging?
could she have been pinging?
could we have been pinging?
could you have been pinging?
could they have been pinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not ping?
could you not ping?
could she not ping?
could we not ping?
could you not ping?
could they not ping? 	could I not be pinging?
could you not be pinging?
could she not be pinging?
could we not be pinging?
could you not be pinging?
could they not be pinging? 	could I not have pinged?
could you not have pinged?
could she not have pinged?
could we not have pinged?
could you not have pinged?
could they not have pinged? 	could I not have been pinging?
could you not have been pinging?
could she not have been pinging?
could we not have been pinging?
could you not have been pinging?
could they not have been pinging?