English verb conjugation
CAN PRECERTIFY

Regular verb: precertify - precertified - precertified

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I cannot precertify you cannot precertify she cannot precertify we cannot precertify you cannot precertify they cannot precertify	I cannot be precertifying you cannot be precertifying she cannot be precertifying we cannot be precertifying you cannot be precertifying they cannot be precertifying
Perfect	V-ing perfect
I cannot have precertified you cannot have precertified she cannot have precertified we cannot have precertified you cannot have precertified they cannot have precertified	I cannot have been precertifying you cannot have been precertifying she cannot have been precertifying we cannot have been precertifying you cannot have been precertifying they cannot have been precertifying

Interrogative form

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