could engineer
Regular verb: engineer - engineered- engineered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could engineer
you could engineer
he could engineer
we could engineer
you could engineer
they could engineer 	I could be engineering
you could be engineering
he could be engineering
we could be engineering
you could be engineering
they could be engineering	I could have engineered
you could have engineered
he could have engineered
we could have engineered
you could have engineered
they could have engineered	I could have been engineering
you could have been engineering
he could have been engineering
we could have been engineering
you could have been engineering
they could have been engineering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't engineer
you couldn't engineer
he couldn't engineer
we couldn't engineer
you couldn't engineer
they couldn't engineer 	I couldn't be engineering
you couldn't be engineering
he couldn't be engineering
we couldn't be engineering
you couldn't be engineering
they couldn't be engineering	I couldn't have engineered
you couldn't have engineered
he couldn't have engineered
we couldn't have engineered
you couldn't have engineered
they couldn't have engineered	I couldn't have been engineering
you couldn't have been engineering
he couldn't have been engineering
we couldn't have been engineering
you couldn't have been engineering
they couldn't have been engineering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I engineer?
could you engineer?
could he engineer?
could we engineer?
could you engineer?
could they engineer? 	could I be engineering?
could you be engineering?
could he be engineering?
could we be engineering?
could you be engineering?
could they be engineering? 	could I have engineered?
could you have engineered?
could he have engineered?
could we have engineered?
could you have engineered?
could they have engineered? 	could I have been engineering?
could you have been engineering?
could he have been engineering?
could we have been engineering?
could you have been engineering?
could they have been engineering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I engineer?
couldn't you engineer?
couldn't he engineer?
couldn't we engineer?
couldn't you engineer?
couldn't they engineer? 	couldn't I be engineering?
couldn't you be engineering?
couldn't he be engineering?
couldn't we be engineering?
couldn't you be engineering?
couldn't they be engineering? 	couldn't I have engineered?
couldn't you have engineered?
couldn't he have engineered?
couldn't we have engineered?
couldn't you have engineered?
couldn't they have engineered? 	couldn't I have been engineering?
couldn't you have been engineering?
couldn't he have been engineering?
couldn't we have been engineering?
couldn't you have been engineering?
couldn't they have been engineering?