I could crowd you could crowd she could crowd we could crowd you could crowd they could crowd
V-ing form
I could be crowding you could be crowding she could be crowding we could be crowding you could be crowding they could be crowding
Perfect
I could have crowded you could have crowded she could have crowded we could have crowded you could have crowded they could have crowded
V-ing perfect
I could have been crowding you could have been crowding she could have been crowding we could have been crowding you could have been crowding they could have been crowding
Negation
Simple form
I could not crowd you could not crowd she could not crowd we could not crowd you could not crowd they could not crowd
V-ing form
I could not be crowding you could not be crowding she could not be crowding we could not be crowding you could not be crowding they could not be crowding
Perfect
I could not have crowded you could not have crowded she could not have crowded we could not have crowded you could not have crowded they could not have crowded
V-ing perfect
I could not have been crowding you could not have been crowding she could not have been crowding we could not have been crowding you could not have been crowding they could not have been crowding
Interrogative form
Simple form
could I crowd? could you crowd? could she crowd? could we crowd? could you crowd? could they crowd?
V-ing form
could I be crowding? could you be crowding? could she be crowding? could we be crowding? could you be crowding? could they be crowding?
Perfect
could I have crowded? could you have crowded? could she have crowded? could we have crowded? could you have crowded? could they have crowded?
V-ing perfect
could I have been crowding? could you have been crowding? could she have been crowding? could we have been crowding? could you have been crowding? could they have been crowding?
Interro-negative form
Simple form
could I not crowd? could you not crowd? could she not crowd? could we not crowd? could you not crowd? could they not crowd?
V-ing form
could I not be crowding? could you not be crowding? could she not be crowding? could we not be crowding? could you not be crowding? could they not be crowding?
Perfect
could I not have crowded? could you not have crowded? could she not have crowded? could we not have crowded? could you not have crowded? could they not have crowded?
V-ing perfect
could I not have been crowding? could you not have been crowding? could she not have been crowding? could we not have been crowding? could you not have been crowding? could they not have been crowding?