I can roar you can roar he can roar we can roar you can roar they can roar
V-ing form
I can be roaring you can be roaring he can be roaring we can be roaring you can be roaring they can be roaring
Perfect
I can have roared you can have roared he can have roared we can have roared you can have roared they can have roared
V-ing perfect
I can have been roaring you can have been roaring he can have been roaring we can have been roaring you can have been roaring they can have been roaring
Negation
Simple form
I cannot roar you cannot roar he cannot roar we cannot roar you cannot roar they cannot roar
V-ing form
I cannot be roaring you cannot be roaring he cannot be roaring we cannot be roaring you cannot be roaring they cannot be roaring
Perfect
I cannot have roared you cannot have roared he cannot have roared we cannot have roared you cannot have roared they cannot have roared
V-ing perfect
I cannot have been roaring you cannot have been roaring he cannot have been roaring we cannot have been roaring you cannot have been roaring they cannot have been roaring
Interrogative form
Simple form
can I roar? can you roar? can he roar? can we roar? can you roar? can they roar?
V-ing form
can I be roaring? can you be roaring? can he be roaring? can we be roaring? can you be roaring? can they be roaring?
Perfect
can I have roared? can you have roared? can he have roared? can we have roared? can you have roared? can they have roared?
V-ing perfect
can I have been roaring? can you have been roaring? can he have been roaring? can we have been roaring? can you have been roaring? can they have been roaring?
Interro-negative form
Simple form
can I not roar? can you not roar? can he not roar? can we not roar? can you not roar? can they not roar?
V-ing form
can I not be roaring? can you not be roaring? can he not be roaring? can we not be roaring? can you not be roaring? can they not be roaring?
Perfect
can I not have roared? can you not have roared? can he not have roared? can we not have roared? can you not have roared? can they not have roared?
V-ing perfect
can I not have been roaring? can you not have been roaring? can he not have been roaring? can we not have been roaring? can you not have been roaring? can they not have been roaring?