I can congregate you can congregate she can congregate we can congregate you can congregate they can congregate
V-ing form
I can be congregating you can be congregating she can be congregating we can be congregating you can be congregating they can be congregating
Perfect
I can have congregated you can have congregated she 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 she 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 she 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 she 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 she 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 she 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 she congregate? can we congregate? can you congregate? can they congregate?
V-ing form
can I be congregating? can you be congregating? can she be congregating? can we be congregating? can you be congregating? can they be congregating?
Perfect
can I have congregated? can you have congregated? can she 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 she 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 she 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 she 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 she 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 she have been congregating? can't we have been congregating? can't you have been congregating? can't they have been congregating?