I can congregate you can congregate he can congregate we can congregate you can congregate they can congregate
V-ing form
I can be congregating you can be congregating he can be congregating we can be congregating you can be congregating they can be congregating
Perfect
I can have congregated you can have congregated he can have congregated we can have congregated you can have congregated they can have congregated
V-ing perfect
I can have been congregating you can have been congregating he can have been congregating we can have been congregating you can have been congregating they can have been congregating
Negation
Simple form
I can't congregate you can't congregate he can't congregate we can't congregate you can't congregate they can't congregate
V-ing form
I can't be congregating you can't be congregating he can't be congregating we can't be congregating you can't be congregating they can't be congregating
Perfect
I can't have congregated you can't have congregated he can't have congregated we can't have congregated you can't have congregated they can't have congregated
V-ing perfect
I can't have been congregating you can't have been congregating he can't have been congregating we can't have been congregating you can't have been congregating they can't have been congregating
Interrogative form
Simple form
can I congregate? can you congregate? can he congregate? can we congregate? can you congregate? can they congregate?
V-ing form
can I be congregating? can you be congregating? can he be congregating? can we be congregating? can you be congregating? can they be congregating?
Perfect
can I have congregated? can you have congregated? can he have congregated? can we have congregated? can you have congregated? can they have congregated?
V-ing perfect
can I have been congregating? can you have been congregating? can he have been congregating? can we have been congregating? can you have been congregating? can they have been congregating?
Interro-negative form
Simple form
can't I congregate? can't you congregate? can't he congregate? can't we congregate? can't you congregate? can't they congregate?
V-ing form
can't I be congregating? can't you be congregating? can't he be congregating? can't we be congregating? can't you be congregating? can't they be congregating?
Perfect
can't I have congregated? can't you have congregated? can't he have congregated? can't we have congregated? can't you have congregated? can't they have congregated?
V-ing perfect
can't I have been congregating? can't you have been congregating? can't he have been congregating? can't we have been congregating? can't you have been congregating? can't they have been congregating?