SIMPLE PRESENT
Affirmative
- I duff
- you duff
- she/he/it duffs
- we duff
- you duff
- they duff
Negative
- I do not duff
- you do not duff
- she/he/it does not duff
- we do not duff
- you do not duff
- they do not duff
Interrogative
- do I duff ?
- do you duff ?
- does she/he/it duff ?
- do we duff ?
- do you duff ?
- do they duff ?
Negative - Interrogative
- do I not duff ?
- do you not duff ?
- does she/he/it not duff ?
- do we not duff ?
- do you not duff ?
- do they not duff ?
PRESENT CONTINUOUS
Affirmative
- I am duffing
- you are duffing
- she/he/it is duffing
- we are duffing
- you are duffing
- they are duffing
Negative
- I am not duffing
- you are not duffing
- she/he/it is not duffing
- we are not duffing
- you are not duffing
- they are not duffing
Interrogative
- am I duffing ?
- are you duffing ?
- is she/he/it duffing ?
- are we duffing ?
- are you duffing ?
- are they duffing ?
Negative - Interrogative
- am I not duffing ?
- are you not duffing ?
- is she/he/it not duffing ?
- are we not duffing ?
- are you not duffing ?
- are they not duffing ?
SIMPLE PAST
Affirmative
- I duffed
- you duffed
- she/he/it duffed
- we duffed
- you duffed
- they duffed
Negative
- I did not duff
- you did not duff
- she/he/it did not duff
- we did not duff
- you did not duff
- they did not duff
Interrogative
- did I duff ?
- did you duff ?
- did she/he/it duff ?
- did we duff ?
- did you duff ?
- did they duff ?
Negative - Interrogative
- did I not duff ?
- did you not duff ?
- did she/he/it not duff ?
- did we not duff ?
- did you not duff ?
- did they not duff ?
PRESENT PERFECT
Affirmative
- I have duffed
- you have duffed
- she/he/it has duffed
- we have duffed
- you have duffed
- they have duffed
Negative
- I have not duffed
- you have not duffed
- she/he/it has not duffed
- we have not duffed
- you have not duffed
- they have not duffed
Interrogative
- have I duffed ?
- have you duffed ?
- has she/he/it duffed ?
- have we duffed ?
- have you duffed ?
- have they duffed ?
Negative - Interrogative
- have I not duffed ?
- have you not duffed ?
- has she/he/it not duffed ?
- have we not duffed ?
- have you not duffed ?
- have they not duffed ?
PAST CONTINUOUS
Affirmative
- I was duffing
- you were duffing
- she/he/it was duffing
- we were duffing
- you were duffing
- they were duffing
Negative
- I was not duffing
- you were not duffing
- she/he/it was not duffing
- you were not duffing
- you were not duffing
- they were not duffing
Interrogative
- was I duffing ?
- were you duffing ?
- was she/he/it duffing ?
- were we duffing ?
- were you duffing ?
- were they duffing ?
Negative - Interrogative
- was I not duffing ?
- were you not duffing ?
- was she/he/it not duffing ?
- were we not duffing ?
- were you not duffing ?
- were they not duffing ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been duffing
- you have been duffing
- she/he/it has been duffing
- we have been duffing
- you have been duffing
- they have been duffing
Negative
- I have not been duffing
- you have not been duffing
- she/he/it has not been duffing
- we have not been duffing
- you have not been duffing
- they have not been duffing
Interrogative
- have I been duffing ?
- have you been duffing ?
- has she/he/it been duffing ?
- have we been duffing ?
- have you been duffing ?
- have they been duffing ?
Negative - Interrogative
- have I not been duffing ?
- have you not been duffing ?
- has she/he/it not been duffing ?
- have we not been duffing ?
- have you not been duffing ?
- have they not been duffing ?
PAST PERFECT
Affirmative
- I had duffed
- you had duffed
- she/he/it had duffed
- we had duffed
- you had duffed
- they had duffed
Negative
- I had not duffed
- you had not duffed
- she/he/it had not duffed
- we had not duffed
- you had not duffed
- they had not duffed
Interrogative
- had I duffed ?
- had you duffed ?
- had she/he/it duffed ?
- had we duffed ?
- had you duffed ?
- had they duffed ?
Negative - Interrogative
- had I not duffed ?
- had you not duffed ?
- had she/he/it not duffed ?
- had we not duffed ?
- had you not duffed ?
- had they not duffed ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been duffing
- you had been duffing
- she/he/it had been duffing
- we had been duffing
- you had been duffing
- they had been duffing
Negative
- I had not been duffing
- you had not been duffing
- she/he/it had not been duffing
- we had not been duffing
- you had not been duffing
- they had not been duffing
Interrogative
- had I been duffing ?
- had you been duffing ?
- had she/he/it been duffing ?
- had we been duffing ?
- had you been duffing ?
- had they been duffing ?
Negative - Interrogative
- had I not been duffing ?
- had you not been duffing ?
- had she/he/it not been duffing ?
- had we not been duffing ?
- had you not been duffing ?
- had they not been duffing ?