could crowd
Regular verb: crowd - crowded- crowded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could crowd
you could crowd
he could crowd
we could crowd
you could crowd
they could crowd 	I could be crowding
you could be crowding
he could be crowding
we could be crowding
you could be crowding
they could be crowding	I could have crowded
you could have crowded
he could have crowded
we could have crowded
you could have crowded
they could have crowded	I could have been crowding
you could have been crowding
he could have been crowding
we could have been crowding
you could have been crowding
they could have been crowding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't crowd
you couldn't crowd
he couldn't crowd
we couldn't crowd
you couldn't crowd
they couldn't crowd 	I couldn't be crowding
you couldn't be crowding
he couldn't be crowding
we couldn't be crowding
you couldn't be crowding
they couldn't be crowding	I couldn't have crowded
you couldn't have crowded
he couldn't have crowded
we couldn't have crowded
you couldn't have crowded
they couldn't have crowded	I couldn't have been crowding
you couldn't have been crowding
he couldn't have been crowding
we couldn't have been crowding
you couldn't have been crowding
they couldn't have been crowding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I crowd?
could you crowd?
could he crowd?
could we crowd?
could you crowd?
could they crowd? 	could I be crowding?
could you be crowding?
could he be crowding?
could we be crowding?
could you be crowding?
could they be crowding? 	could I have crowded?
could you have crowded?
could he have crowded?
could we have crowded?
could you have crowded?
could they have crowded? 	could I have been crowding?
could you have been crowding?
could he have been crowding?
could we have been crowding?
could you have been crowding?
could they have been crowding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I crowd?
couldn't you crowd?
couldn't he crowd?
couldn't we crowd?
couldn't you crowd?
couldn't they crowd? 	couldn't I be crowding?
couldn't you be crowding?
couldn't he be crowding?
couldn't we be crowding?
couldn't you be crowding?
couldn't they be crowding? 	couldn't I have crowded?
couldn't you have crowded?
couldn't he have crowded?
couldn't we have crowded?
couldn't you have crowded?
couldn't they have crowded? 	couldn't I have been crowding?
couldn't you have been crowding?
couldn't he have been crowding?
couldn't we have been crowding?
couldn't you have been crowding?
couldn't they have been crowding?