English verb conjugation
CAN SMOOTHEN

Regular verb: smoothen - smoothened - smoothened

Affirmation

Simple form	V-ing form
I can smoothen you can smoothen he can smoothen we can smoothen you can smoothen they can smoothen	I can be smoothening you can be smoothening he can be smoothening we can be smoothening you can be smoothening they can be smoothening
Perfect	V-ing perfect
I can have smoothened you can have smoothened he can have smoothened we can have smoothened you can have smoothened they can have smoothened	I can have been smoothening you can have been smoothening he can have been smoothening we can have been smoothening you can have been smoothening they can have been smoothening

Negation

Simple form	V-ing form
I cannot smoothen you cannot smoothen he cannot smoothen we cannot smoothen you cannot smoothen they cannot smoothen	I cannot be smoothening you cannot be smoothening he cannot be smoothening we cannot be smoothening you cannot be smoothening they cannot be smoothening
Perfect	V-ing perfect
I cannot have smoothened you cannot have smoothened he cannot have smoothened we cannot have smoothened you cannot have smoothened they cannot have smoothened	I cannot have been smoothening you cannot have been smoothening he cannot have been smoothening we cannot have been smoothening you cannot have been smoothening they cannot have been smoothening

Interrogative form

Simple form	V-ing form
can I smoothen? can you smoothen? can he smoothen? can we smoothen? can you smoothen? can they smoothen?	can I be smoothening? can you be smoothening? can he be smoothening? can we be smoothening? can you be smoothening? can they be smoothening?
Perfect	V-ing perfect
can I have smoothened? can you have smoothened? can he have smoothened? can we have smoothened? can you have smoothened? can they have smoothened?	can I have been smoothening? can you have been smoothening? can he have been smoothening? can we have been smoothening? can you have been smoothening? can they have been smoothening?

Interro-negative form

Simple form	V-ing form
can I not smoothen? can you not smoothen? can he not smoothen? can we not smoothen? can you not smoothen? can they not smoothen?	can I not be smoothening? can you not be smoothening? can he not be smoothening? can we not be smoothening? can you not be smoothening? can they not be smoothening?
Perfect	V-ing perfect
can I not have smoothened? can you not have smoothened? can he not have smoothened? can we not have smoothened? can you not have smoothened? can they not have smoothened?	can I not have been smoothening? can you not have been smoothening? can he not have been smoothening? can we not have been smoothening? can you not have been smoothening? can they not have been smoothening?