English verb conjugation
CAN CERTIFICATE

Regular verb: certificate - certificated - certificated

Affirmation

Simple form	V-ing form
I can certificate you can certificate he can certificate we can certificate you can certificate they can certificate	I can be certificating you can be certificating he can be certificating we can be certificating you can be certificating they can be certificating
Perfect	V-ing perfect
I can have certificated you can have certificated he can have certificated we can have certificated you can have certificated they can have certificated	I can have been certificating you can have been certificating he can have been certificating we can have been certificating you can have been certificating they can have been certificating

Negation

Simple form	V-ing form
I can't certificate you can't certificate he can't certificate we can't certificate you can't certificate they can't certificate	I can't be certificating you can't be certificating he can't be certificating we can't be certificating you can't be certificating they can't be certificating
Perfect	V-ing perfect
I can't have certificated you can't have certificated he can't have certificated we can't have certificated you can't have certificated they can't have certificated	I can't have been certificating you can't have been certificating he can't have been certificating we can't have been certificating you can't have been certificating they can't have been certificating

Interrogative form

Simple form	V-ing form
can I certificate? can you certificate? can he certificate? can we certificate? can you certificate? can they certificate?	can I be certificating? can you be certificating? can he be certificating? can we be certificating? can you be certificating? can they be certificating?
Perfect	V-ing perfect
can I have certificated? can you have certificated? can he have certificated? can we have certificated? can you have certificated? can they have certificated?	can I have been certificating? can you have been certificating? can he have been certificating? can we have been certificating? can you have been certificating? can they have been certificating?

Interro-negative form

Simple form	V-ing form
can't I certificate? can't you certificate? can't he certificate? can't we certificate? can't you certificate? can't they certificate?	can't I be certificating? can't you be certificating? can't he be certificating? can't we be certificating? can't you be certificating? can't they be certificating?
Perfect	V-ing perfect
can't I have certificated? can't you have certificated? can't he have certificated? can't we have certificated? can't you have certificated? can't they have certificated?	can't I have been certificating? can't you have been certificating? can't he have been certificating? can't we have been certificating? can't you have been certificating? can't they have been certificating?