could tinkle
Regular verb: tinkle - tinkled- tinkled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tinkle
you could tinkle
she could tinkle
we could tinkle
you could tinkle
they could tinkle 	I could be tinkling
you could be tinkling
she could be tinkling
we could be tinkling
you could be tinkling
they could be tinkling	I could have tinkled
you could have tinkled
she could have tinkled
we could have tinkled
you could have tinkled
they could have tinkled	I could have been tinkling
you could have been tinkling
she could have been tinkling
we could have been tinkling
you could have been tinkling
they could have been tinkling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tinkle
you couldn't tinkle
she couldn't tinkle
we couldn't tinkle
you couldn't tinkle
they couldn't tinkle 	I couldn't be tinkling
you couldn't be tinkling
she couldn't be tinkling
we couldn't be tinkling
you couldn't be tinkling
they couldn't be tinkling	I couldn't have tinkled
you couldn't have tinkled
she couldn't have tinkled
we couldn't have tinkled
you couldn't have tinkled
they couldn't have tinkled	I couldn't have been tinkling
you couldn't have been tinkling
she couldn't have been tinkling
we couldn't have been tinkling
you couldn't have been tinkling
they couldn't have been tinkling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tinkle?
could you tinkle?
could she tinkle?
could we tinkle?
could you tinkle?
could they tinkle? 	could I be tinkling?
could you be tinkling?
could she be tinkling?
could we be tinkling?
could you be tinkling?
could they be tinkling? 	could I have tinkled?
could you have tinkled?
could she have tinkled?
could we have tinkled?
could you have tinkled?
could they have tinkled? 	could I have been tinkling?
could you have been tinkling?
could she have been tinkling?
could we have been tinkling?
could you have been tinkling?
could they have been tinkling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tinkle?
couldn't you tinkle?
couldn't she tinkle?
couldn't we tinkle?
couldn't you tinkle?
couldn't they tinkle? 	couldn't I be tinkling?
couldn't you be tinkling?
couldn't she be tinkling?
couldn't we be tinkling?
couldn't you be tinkling?
couldn't they be tinkling? 	couldn't I have tinkled?
couldn't you have tinkled?
couldn't she have tinkled?
couldn't we have tinkled?
couldn't you have tinkled?
couldn't they have tinkled? 	couldn't I have been tinkling?
couldn't you have been tinkling?
couldn't she have been tinkling?
couldn't we have been tinkling?
couldn't you have been tinkling?
couldn't they have been tinkling?