could ding
Regular verb: ding - dinged- dinged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ding
you could ding
she could ding
we could ding
you could ding
they could ding 	I could be dinging
you could be dinging
she could be dinging
we could be dinging
you could be dinging
they could be dinging	I could have dinged
you could have dinged
she could have dinged
we could have dinged
you could have dinged
they could have dinged	I could have been dinging
you could have been dinging
she could have been dinging
we could have been dinging
you could have been dinging
they could have been dinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't ding
you couldn't ding
she couldn't ding
we couldn't ding
you couldn't ding
they couldn't ding 	I couldn't be dinging
you couldn't be dinging
she couldn't be dinging
we couldn't be dinging
you couldn't be dinging
they couldn't be dinging	I couldn't have dinged
you couldn't have dinged
she couldn't have dinged
we couldn't have dinged
you couldn't have dinged
they couldn't have dinged	I couldn't have been dinging
you couldn't have been dinging
she couldn't have been dinging
we couldn't have been dinging
you couldn't have been dinging
they couldn't have been dinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I ding?
could you ding?
could she ding?
could we ding?
could you ding?
could they ding? 	could I be dinging?
could you be dinging?
could she be dinging?
could we be dinging?
could you be dinging?
could they be dinging? 	could I have dinged?
could you have dinged?
could she have dinged?
could we have dinged?
could you have dinged?
could they have dinged? 	could I have been dinging?
could you have been dinging?
could she have been dinging?
could we have been dinging?
could you have been dinging?
could they have been dinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I ding?
couldn't you ding?
couldn't she ding?
couldn't we ding?
couldn't you ding?
couldn't they ding? 	couldn't I be dinging?
couldn't you be dinging?
couldn't she be dinging?
couldn't we be dinging?
couldn't you be dinging?
couldn't they be dinging? 	couldn't I have dinged?
couldn't you have dinged?
couldn't she have dinged?
couldn't we have dinged?
couldn't you have dinged?
couldn't they have dinged? 	couldn't I have been dinging?
couldn't you have been dinging?
couldn't she have been dinging?
couldn't we have been dinging?
couldn't you have been dinging?
couldn't they have been dinging?