English verb conjugation
CAN ROAR

Regular verb: roar - roared - roared

Affirmation

Simple form	V-ing form
I can roar you can roar he can roar we can roar you can roar they can roar	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
can I roar? can you roar? can he roar? can we roar? can you roar? can they roar?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?