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 can't roar you can't roar he can't roar we can't roar you can't roar they can't roar
V-ing form
I can't be roaring you can't be roaring he can't be roaring we can't be roaring you can't be roaring they can't be roaring
Perfect
I can't have roared you can't have roared he can't have roared we can't have roared you can't have roared they can't have roared
V-ing perfect
I can't have been roaring you can't have been roaring he can't have been roaring we can't have been roaring you can't have been roaring they can't 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't I roar? can't you roar? can't he roar? can't we roar? can't you roar? can't they roar?
V-ing form
can't I be roaring? can't you be roaring? can't he be roaring? can't we be roaring? can't you be roaring? can't they be roaring?
Perfect
can't I have roared? can't you have roared? can't he have roared? can't we have roared? can't you have roared? can't they have roared?
V-ing perfect
can't I have been roaring? can't you have been roaring? can't he have been roaring? can't we have been roaring? can't you have been roaring? can't they have been roaring?