SIMPLE PRESENT
Affirmative
- I certify
- you certify
- she/he/it certifies
- we certify
- you certify
- they certify
Negative
- I do not certify
- you do not certify
- she/he/it does not certify
- we do not certify
- you do not certify
- they do not certify
Interrogative
- do I certify ?
- do you certify ?
- does she/he/it certify ?
- do we certify ?
- do you certify ?
- do they certify ?
Negative - Interrogative
- do I not certify ?
- do you not certify ?
- does she/he/it not certify ?
- do we not certify ?
- do you not certify ?
- do they not certify ?
PRESENT CONTINUOUS
Affirmative
- I am certifying
- you are certifying
- she/he/it is certifying
- we are certifying
- you are certifying
- they are certifying
Negative
- I am not certifying
- you are not certifying
- she/he/it is not certifying
- we are not certifying
- you are not certifying
- they are not certifying
Interrogative
- am I certifying ?
- are you certifying ?
- is she/he/it certifying ?
- are we certifying ?
- are you certifying ?
- are they certifying ?
Negative - Interrogative
- am I not certifying ?
- are you not certifying ?
- is she/he/it not certifying ?
- are we not certifying ?
- are you not certifying ?
- are they not certifying ?
SIMPLE PAST
Affirmative
- I certified
- you certified
- she/he/it certified
- we certified
- you certified
- they certified
Negative
- I did not certify
- you did not certify
- she/he/it did not certify
- we did not certify
- you did not certify
- they did not certify
Interrogative
- did I certify ?
- did you certify ?
- did she/he/it certify ?
- did we certify ?
- did you certify ?
- did they certify ?
Negative - Interrogative
- did I not certify ?
- did you not certify ?
- did she/he/it not certify ?
- did we not certify ?
- did you not certify ?
- did they not certify ?
PRESENT PERFECT
Affirmative
- I have certified
- you have certified
- she/he/it has certified
- we have certified
- you have certified
- they have certified
Negative
- I have not certified
- you have not certified
- she/he/it has not certified
- we have not certified
- you have not certified
- they have not certified
Interrogative
- have I certified ?
- have you certified ?
- has she/he/it certified ?
- have we certified ?
- have you certified ?
- have they certified ?
Negative - Interrogative
- have I not certified ?
- have you not certified ?
- has she/he/it not certified ?
- have we not certified ?
- have you not certified ?
- have they not certified ?
PAST CONTINUOUS
Affirmative
- I was certifying
- you were certifying
- she/he/it was certifying
- we were certifying
- you were certifying
- they were certifying
Negative
- I was not certifying
- you were not certifying
- she/he/it was not certifying
- you were not certifying
- you were not certifying
- they were not certifying
Interrogative
- was I certifying ?
- were you certifying ?
- was she/he/it certifying ?
- were we certifying ?
- were you certifying ?
- were they certifying ?
Negative - Interrogative
- was I not certifying ?
- were you not certifying ?
- was she/he/it not certifying ?
- were we not certifying ?
- were you not certifying ?
- were they not certifying ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been certifying
- you have been certifying
- she/he/it has been certifying
- we have been certifying
- you have been certifying
- they have been certifying
Negative
- I have not been certifying
- you have not been certifying
- she/he/it has not been certifying
- we have not been certifying
- you have not been certifying
- they have not been certifying
Interrogative
- have I been certifying ?
- have you been certifying ?
- has she/he/it been certifying ?
- have we been certifying ?
- have you been certifying ?
- have they been certifying ?
Negative - Interrogative
- have I not been certifying ?
- have you not been certifying ?
- has she/he/it not been certifying ?
- have we not been certifying ?
- have you not been certifying ?
- have they not been certifying ?
PAST PERFECT
Affirmative
- I had certified
- you had certified
- she/he/it had certified
- we had certified
- you had certified
- they had certified
Negative
- I had not certified
- you had not certified
- she/he/it had not certified
- we had not certified
- you had not certified
- they had not certified
Interrogative
- had I certified ?
- had you certified ?
- had she/he/it certified ?
- had we certified ?
- had you certified ?
- had they certified ?
Negative - Interrogative
- had I not certified ?
- had you not certified ?
- had she/he/it not certified ?
- had we not certified ?
- had you not certified ?
- had they not certified ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been certifying
- you had been certifying
- she/he/it had been certifying
- we had been certifying
- you had been certifying
- they had been certifying
Negative
- I had not been certifying
- you had not been certifying
- she/he/it had not been certifying
- we had not been certifying
- you had not been certifying
- they had not been certifying
Interrogative
- had I been certifying ?
- had you been certifying ?
- had she/he/it been certifying ?
- had we been certifying ?
- had you been certifying ?
- had they been certifying ?
Negative - Interrogative
- had I not been certifying ?
- had you not been certifying ?
- had she/he/it not been certifying ?
- had we not been certifying ?
- had you not been certifying ?
- had they not been certifying ?