I don't certify you don't certify he doesn't certify we don't certify you don't certify they don't certify
Present continuous
I'm not certifying you aren't certifying he isn't certifying we aren't certifying you aren't certifying they aren't certifying
Preterite
I didn't certify you didn't certify he didn't certify we didn't certify you didn't certify they didn't certify
Preterite continuous
I wasn't certifying you weren't certifying he wasn't certifying we weren't certifying you weren't certifying they weren't certifying
Present perfect
I haven't certified you haven't certified he hasn't certified we haven't certified you haven't certified they haven't certified
Present perfect continuous
I haven't been certifying you haven't been certifying he hasn't been certifying we haven't been certifying you haven't been certifying they haven't been certifying
Pluperfect
I hadn't certified you hadn't certified he hadn't certified we hadn't certified you hadn't certified they hadn't certified
Pluperfect continuous
I hadn't been certifying you hadn't been certifying he hadn't been certifying we hadn't been certifying you hadn't been certifying they hadn't been certifying
Future
I won't certify you won't certify he won't certify we won't certify you won't certify they won't certify
Future continuous
I won't be certifying you won't be certifying he won't be certifying we won't be certifying you won't be certifying they won't be certifying
Future perfect
I won't have certified you won't have certified he won't have certified we won't have certified you won't have certified they won't have certified
Future perfect continuous
I won't have been certifying you won't have been certifying he won't have been certifying we won't have been certifying you won't have been certifying they won't have been certifying
Conditional
Present
I wouldn't certify you wouldn't certify he wouldn't certify we wouldn't certify you wouldn't certify they wouldn't certify
Present continuous
I wouldn't be certifying you wouldn't be certifying he wouldn't be certifying we wouldn't be certifying you wouldn't be certifying they wouldn't be certifying
Past
I wouldn't have certified you wouldn't have certified he wouldn't have certified we wouldn't have certified you wouldn't have certified they wouldn't have certified
Past continuous
I wouldn't have been certifying you wouldn't have been certifying he wouldn't have been certifying we wouldn't have been certifying you wouldn't have been certifying they wouldn't have been certifying