could tower
Regular verb: tower - towered- towered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tower
you could tower
he could tower
we could tower
you could tower
they could tower 	I could be towering
you could be towering
he could be towering
we could be towering
you could be towering
they could be towering	I could have towered
you could have towered
he could have towered
we could have towered
you could have towered
they could have towered	I could have been towering
you could have been towering
he could have been towering
we could have been towering
you could have been towering
they could have been towering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tower
you couldn't tower
he couldn't tower
we couldn't tower
you couldn't tower
they couldn't tower 	I couldn't be towering
you couldn't be towering
he couldn't be towering
we couldn't be towering
you couldn't be towering
they couldn't be towering	I couldn't have towered
you couldn't have towered
he couldn't have towered
we couldn't have towered
you couldn't have towered
they couldn't have towered	I couldn't have been towering
you couldn't have been towering
he couldn't have been towering
we couldn't have been towering
you couldn't have been towering
they couldn't have been towering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tower?
could you tower?
could he tower?
could we tower?
could you tower?
could they tower? 	could I be towering?
could you be towering?
could he be towering?
could we be towering?
could you be towering?
could they be towering? 	could I have towered?
could you have towered?
could he have towered?
could we have towered?
could you have towered?
could they have towered? 	could I have been towering?
could you have been towering?
could he have been towering?
could we have been towering?
could you have been towering?
could they have been towering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tower?
couldn't you tower?
couldn't he tower?
couldn't we tower?
couldn't you tower?
couldn't they tower? 	couldn't I be towering?
couldn't you be towering?
couldn't he be towering?
couldn't we be towering?
couldn't you be towering?
couldn't they be towering? 	couldn't I have towered?
couldn't you have towered?
couldn't he have towered?
couldn't we have towered?
couldn't you have towered?
couldn't they have towered? 	couldn't I have been towering?
couldn't you have been towering?
couldn't he have been towering?
couldn't we have been towering?
couldn't you have been towering?
couldn't they have been towering?