could scheme
Regular verb: scheme - schemed- schemed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scheme
you could scheme
he could scheme
we could scheme
you could scheme
they could scheme 	I could be scheming
you could be scheming
he could be scheming
we could be scheming
you could be scheming
they could be scheming	I could have schemed
you could have schemed
he could have schemed
we could have schemed
you could have schemed
they could have schemed	I could have been scheming
you could have been scheming
he could have been scheming
we could have been scheming
you could have been scheming
they could have been scheming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't scheme
you couldn't scheme
he couldn't scheme
we couldn't scheme
you couldn't scheme
they couldn't scheme 	I couldn't be scheming
you couldn't be scheming
he couldn't be scheming
we couldn't be scheming
you couldn't be scheming
they couldn't be scheming	I couldn't have schemed
you couldn't have schemed
he couldn't have schemed
we couldn't have schemed
you couldn't have schemed
they couldn't have schemed	I couldn't have been scheming
you couldn't have been scheming
he couldn't have been scheming
we couldn't have been scheming
you couldn't have been scheming
they couldn't have been scheming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scheme?
could you scheme?
could he scheme?
could we scheme?
could you scheme?
could they scheme? 	could I be scheming?
could you be scheming?
could he be scheming?
could we be scheming?
could you be scheming?
could they be scheming? 	could I have schemed?
could you have schemed?
could he have schemed?
could we have schemed?
could you have schemed?
could they have schemed? 	could I have been scheming?
could you have been scheming?
could he have been scheming?
could we have been scheming?
could you have been scheming?
could they have been scheming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I scheme?
couldn't you scheme?
couldn't he scheme?
couldn't we scheme?
couldn't you scheme?
couldn't they scheme? 	couldn't I be scheming?
couldn't you be scheming?
couldn't he be scheming?
couldn't we be scheming?
couldn't you be scheming?
couldn't they be scheming? 	couldn't I have schemed?
couldn't you have schemed?
couldn't he have schemed?
couldn't we have schemed?
couldn't you have schemed?
couldn't they have schemed? 	couldn't I have been scheming?
couldn't you have been scheming?
couldn't he have been scheming?
couldn't we have been scheming?
couldn't you have been scheming?
couldn't they have been scheming?