could grease
Regular verb: grease - greased- greased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could grease
you could grease
he could grease
we could grease
you could grease
they could grease 	I could be greasing
you could be greasing
he could be greasing
we could be greasing
you could be greasing
they could be greasing	I could have greased
you could have greased
he could have greased
we could have greased
you could have greased
they could have greased	I could have been greasing
you could have been greasing
he could have been greasing
we could have been greasing
you could have been greasing
they could have been greasing	

Negation 	
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I couldn't grease
you couldn't grease
he couldn't grease
we couldn't grease
you couldn't grease
they couldn't grease 	I couldn't be greasing
you couldn't be greasing
he couldn't be greasing
we couldn't be greasing
you couldn't be greasing
they couldn't be greasing	I couldn't have greased
you couldn't have greased
he couldn't have greased
we couldn't have greased
you couldn't have greased
they couldn't have greased	I couldn't have been greasing
you couldn't have been greasing
he couldn't have been greasing
we couldn't have been greasing
you couldn't have been greasing
they couldn't have been greasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I grease?
could you grease?
could he grease?
could we grease?
could you grease?
could they grease? 	could I be greasing?
could you be greasing?
could he be greasing?
could we be greasing?
could you be greasing?
could they be greasing? 	could I have greased?
could you have greased?
could he have greased?
could we have greased?
could you have greased?
could they have greased? 	could I have been greasing?
could you have been greasing?
could he have been greasing?
could we have been greasing?
could you have been greasing?
could they have been greasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I grease?
couldn't you grease?
couldn't he grease?
couldn't we grease?
couldn't you grease?
couldn't they grease? 	couldn't I be greasing?
couldn't you be greasing?
couldn't he be greasing?
couldn't we be greasing?
couldn't you be greasing?
couldn't they be greasing? 	couldn't I have greased?
couldn't you have greased?
couldn't he have greased?
couldn't we have greased?
couldn't you have greased?
couldn't they have greased? 	couldn't I have been greasing?
couldn't you have been greasing?
couldn't he have been greasing?
couldn't we have been greasing?
couldn't you have been greasing?
couldn't they have been greasing?