could zing
Regular verb: zing - zinged- zinged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could zing
you could zing
he could zing
we could zing
you could zing
they could zing 	I could be zinging
you could be zinging
he could be zinging
we could be zinging
you could be zinging
they could be zinging	I could have zinged
you could have zinged
he could have zinged
we could have zinged
you could have zinged
they could have zinged	I could have been zinging
you could have been zinging
he could have been zinging
we could have been zinging
you could have been zinging
they could have been zinging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't zing
you couldn't zing
he couldn't zing
we couldn't zing
you couldn't zing
they couldn't zing 	I couldn't be zinging
you couldn't be zinging
he couldn't be zinging
we couldn't be zinging
you couldn't be zinging
they couldn't be zinging	I couldn't have zinged
you couldn't have zinged
he couldn't have zinged
we couldn't have zinged
you couldn't have zinged
they couldn't have zinged	I couldn't have been zinging
you couldn't have been zinging
he couldn't have been zinging
we couldn't have been zinging
you couldn't have been zinging
they couldn't have been zinging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I zing?
could you zing?
could he zing?
could we zing?
could you zing?
could they zing? 	could I be zinging?
could you be zinging?
could he be zinging?
could we be zinging?
could you be zinging?
could they be zinging? 	could I have zinged?
could you have zinged?
could he have zinged?
could we have zinged?
could you have zinged?
could they have zinged? 	could I have been zinging?
could you have been zinging?
could he have been zinging?
could we have been zinging?
could you have been zinging?
could they have been zinging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I zing?
couldn't you zing?
couldn't he zing?
couldn't we zing?
couldn't you zing?
couldn't they zing? 	couldn't I be zinging?
couldn't you be zinging?
couldn't he be zinging?
couldn't we be zinging?
couldn't you be zinging?
couldn't they be zinging? 	couldn't I have zinged?
couldn't you have zinged?
couldn't he have zinged?
couldn't we have zinged?
couldn't you have zinged?
couldn't they have zinged? 	couldn't I have been zinging?
couldn't you have been zinging?
couldn't he have been zinging?
couldn't we have been zinging?
couldn't you have been zinging?
couldn't they have been zinging?