could landmark
Regular verb: landmark - landmarked- landmarked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could landmark
you could landmark
he could landmark
we could landmark
you could landmark
they could landmark 	I could be landmarking
you could be landmarking
he could be landmarking
we could be landmarking
you could be landmarking
they could be landmarking	I could have landmarked
you could have landmarked
he could have landmarked
we could have landmarked
you could have landmarked
they could have landmarked	I could have been landmarking
you could have been landmarking
he could have been landmarking
we could have been landmarking
you could have been landmarking
they could have been landmarking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't landmark
you couldn't landmark
he couldn't landmark
we couldn't landmark
you couldn't landmark
they couldn't landmark 	I couldn't be landmarking
you couldn't be landmarking
he couldn't be landmarking
we couldn't be landmarking
you couldn't be landmarking
they couldn't be landmarking	I couldn't have landmarked
you couldn't have landmarked
he couldn't have landmarked
we couldn't have landmarked
you couldn't have landmarked
they couldn't have landmarked	I couldn't have been landmarking
you couldn't have been landmarking
he couldn't have been landmarking
we couldn't have been landmarking
you couldn't have been landmarking
they couldn't have been landmarking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I landmark?
could you landmark?
could he landmark?
could we landmark?
could you landmark?
could they landmark? 	could I be landmarking?
could you be landmarking?
could he be landmarking?
could we be landmarking?
could you be landmarking?
could they be landmarking? 	could I have landmarked?
could you have landmarked?
could he have landmarked?
could we have landmarked?
could you have landmarked?
could they have landmarked? 	could I have been landmarking?
could you have been landmarking?
could he have been landmarking?
could we have been landmarking?
could you have been landmarking?
could they have been landmarking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I landmark?
couldn't you landmark?
couldn't he landmark?
couldn't we landmark?
couldn't you landmark?
couldn't they landmark? 	couldn't I be landmarking?
couldn't you be landmarking?
couldn't he be landmarking?
couldn't we be landmarking?
couldn't you be landmarking?
couldn't they be landmarking? 	couldn't I have landmarked?
couldn't you have landmarked?
couldn't he have landmarked?
couldn't we have landmarked?
couldn't you have landmarked?
couldn't they have landmarked? 	couldn't I have been landmarking?
couldn't you have been landmarking?
couldn't he have been landmarking?
couldn't we have been landmarking?
couldn't you have been landmarking?
couldn't they have been landmarking?