could park
Regular verb: park - parked- parked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could park
you could park
he could park
we could park
you could park
they could park 	I could be parking
you could be parking
he could be parking
we could be parking
you could be parking
they could be parking	I could have parked
you could have parked
he could have parked
we could have parked
you could have parked
they could have parked	I could have been parking
you could have been parking
he could have been parking
we could have been parking
you could have been parking
they could have been parking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't park
you couldn't park
he couldn't park
we couldn't park
you couldn't park
they couldn't park 	I couldn't be parking
you couldn't be parking
he couldn't be parking
we couldn't be parking
you couldn't be parking
they couldn't be parking	I couldn't have parked
you couldn't have parked
he couldn't have parked
we couldn't have parked
you couldn't have parked
they couldn't have parked	I couldn't have been parking
you couldn't have been parking
he couldn't have been parking
we couldn't have been parking
you couldn't have been parking
they couldn't have been parking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I park?
could you park?
could he park?
could we park?
could you park?
could they park? 	could I be parking?
could you be parking?
could he be parking?
could we be parking?
could you be parking?
could they be parking? 	could I have parked?
could you have parked?
could he have parked?
could we have parked?
could you have parked?
could they have parked? 	could I have been parking?
could you have been parking?
could he have been parking?
could we have been parking?
could you have been parking?
could they have been parking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I park?
couldn't you park?
couldn't he park?
couldn't we park?
couldn't you park?
couldn't they park? 	couldn't I be parking?
couldn't you be parking?
couldn't he be parking?
couldn't we be parking?
couldn't you be parking?
couldn't they be parking? 	couldn't I have parked?
couldn't you have parked?
couldn't he have parked?
couldn't we have parked?
couldn't you have parked?
couldn't they have parked? 	couldn't I have been parking?
couldn't you have been parking?
couldn't he have been parking?
couldn't we have been parking?
couldn't you have been parking?
couldn't they have been parking?