should certificate
Regular verb: certificate - certificated- certificated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should certificate
you should certificate
she should certificate
we should certificate
you should certificate
they should certificate 	I should be certificating
you should be certificating
she should be certificating
we should be certificating
you should be certificating
they should be certificating	I should have certificated
you should have certificated
she should have certificated
we should have certificated
you should have certificated
they should have certificated	I should have been certificating
you should have been certificating
she should have been certificating
we should have been certificating
you should have been certificating
they should have been certificating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not certificate
you should not certificate
she should not certificate
we should not certificate
you should not certificate
they should not certificate 	I should not be certificating
you should not be certificating
she should not be certificating
we should not be certificating
you should not be certificating
they should not be certificating	I should not have certificated
you should not have certificated
she should not have certificated
we should not have certificated
you should not have certificated
they should not have certificated	I should not have been certificating
you should not have been certificating
she should not have been certificating
we should not have been certificating
you should not have been certificating
they should not have been certificating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I certificate?
should you certificate?
should she certificate?
should we certificate?
should you certificate?
should they certificate? 	should I be certificating?
should you be certificating?
should she be certificating?
should we be certificating?
should you be certificating?
should they be certificating? 	should I have certificated?
should you have certificated?
should she have certificated?
should we have certificated?
should you have certificated?
should they have certificated? 	should I have been certificating?
should you have been certificating?
should she have been certificating?
should we have been certificating?
should you have been certificating?
should they have been certificating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not certificate?
should you not certificate?
should she not certificate?
should we not certificate?
should you not certificate?
should they not certificate? 	should I not be certificating?
should you not be certificating?
should she not be certificating?
should we not be certificating?
should you not be certificating?
should they not be certificating? 	should I not have certificated?
should you not have certificated?
should she not have certificated?
should we not have certificated?
should you not have certificated?
should they not have certificated? 	should I not have been certificating?
should you not have been certificating?
should she not have been certificating?
should we not have been certificating?
should you not have been certificating?
should they not have been certificating?