can precertify
Regular verb: precertify - precertified- precertified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can precertify
you can precertify
she can precertify
we can precertify
you can precertify
they can precertify 	I can be precertifying
you can be precertifying
she can be precertifying
we can be precertifying
you can be precertifying
they can be precertifying	I can have precertified
you can have precertified
she can have precertified
we can have precertified
you can have precertified
they can have precertified	I can have been precertifying
you can have been precertifying
she can have been precertifying
we can have been precertifying
you can have been precertifying
they can have been precertifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't precertify
you can't precertify
she can't precertify
we can't precertify
you can't precertify
they can't precertify 	I can't be precertifying
you can't be precertifying
she can't be precertifying
we can't be precertifying
you can't be precertifying
they can't be precertifying	I can't have precertified
you can't have precertified
she can't have precertified
we can't have precertified
you can't have precertified
they can't have precertified	I can't have been precertifying
you can't have been precertifying
she can't have been precertifying
we can't have been precertifying
you can't have been precertifying
they can't have been precertifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I precertify?
can you precertify?
can she precertify?
can we precertify?
can you precertify?
can they precertify? 	can I be precertifying?
can you be precertifying?
can she be precertifying?
can we be precertifying?
can you be precertifying?
can they be precertifying? 	can I have precertified?
can you have precertified?
can she have precertified?
can we have precertified?
can you have precertified?
can they have precertified? 	can I have been precertifying?
can you have been precertifying?
can she have been precertifying?
can we have been precertifying?
can you have been precertifying?
can they have been precertifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I precertify?
can't you precertify?
can't she precertify?
can't we precertify?
can't you precertify?
can't they precertify? 	can't I be precertifying?
can't you be precertifying?
can't she be precertifying?
can't we be precertifying?
can't you be precertifying?
can't they be precertifying? 	can't I have precertified?
can't you have precertified?
can't she have precertified?
can't we have precertified?
can't you have precertified?
can't they have precertified? 	can't I have been precertifying?
can't you have been precertifying?
can't she have been precertifying?
can't we have been precertifying?
can't you have been precertifying?
can't they have been precertifying?