SIMPLE PRESENT
Affirmative
- I doubt
- you doubt
- she/he/it doubts
- we doubt
- you doubt
- they doubt
Negative
- I do not doubt
- you do not doubt
- she/he/it does not doubt
- we do not doubt
- you do not doubt
- they do not doubt
Interrogative
- do I doubt ?
- do you doubt ?
- does she/he/it doubt ?
- do we doubt ?
- do you doubt ?
- do they doubt ?
Negative - Interrogative
- do I not doubt ?
- do you not doubt ?
- does she/he/it not doubt ?
- do we not doubt ?
- do you not doubt ?
- do they not doubt ?
PRESENT CONTINUOUS
Affirmative
- I am doubting
- you are doubting
- she/he/it is doubting
- we are doubting
- you are doubting
- they are doubting
Negative
- I am not doubting
- you are not doubting
- she/he/it is not doubting
- we are not doubting
- you are not doubting
- they are not doubting
Interrogative
- am I doubting ?
- are you doubting ?
- is she/he/it doubting ?
- are we doubting ?
- are you doubting ?
- are they doubting ?
Negative - Interrogative
- am I not doubting ?
- are you not doubting ?
- is she/he/it not doubting ?
- are we not doubting ?
- are you not doubting ?
- are they not doubting ?
SIMPLE PAST
Affirmative
- I doubted
- you doubted
- she/he/it doubted
- we doubted
- you doubted
- they doubted
Negative
- I did not doubt
- you did not doubt
- she/he/it did not doubt
- we did not doubt
- you did not doubt
- they did not doubt
Interrogative
- did I doubt ?
- did you doubt ?
- did she/he/it doubt ?
- did we doubt ?
- did you doubt ?
- did they doubt ?
Negative - Interrogative
- did I not doubt ?
- did you not doubt ?
- did she/he/it not doubt ?
- did we not doubt ?
- did you not doubt ?
- did they not doubt ?
PRESENT PERFECT
Affirmative
- I have doubted
- you have doubted
- she/he/it has doubted
- we have doubted
- you have doubted
- they have doubted
Negative
- I have not doubted
- you have not doubted
- she/he/it has not doubted
- we have not doubted
- you have not doubted
- they have not doubted
Interrogative
- have I doubted ?
- have you doubted ?
- has she/he/it doubted ?
- have we doubted ?
- have you doubted ?
- have they doubted ?
Negative - Interrogative
- have I not doubted ?
- have you not doubted ?
- has she/he/it not doubted ?
- have we not doubted ?
- have you not doubted ?
- have they not doubted ?
PAST CONTINUOUS
Affirmative
- I was doubting
- you were doubting
- she/he/it was doubting
- we were doubting
- you were doubting
- they were doubting
Negative
- I was not doubting
- you were not doubting
- she/he/it was not doubting
- you were not doubting
- you were not doubting
- they were not doubting
Interrogative
- was I doubting ?
- were you doubting ?
- was she/he/it doubting ?
- were we doubting ?
- were you doubting ?
- were they doubting ?
Negative - Interrogative
- was I not doubting ?
- were you not doubting ?
- was she/he/it not doubting ?
- were we not doubting ?
- were you not doubting ?
- were they not doubting ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been doubting
- you have been doubting
- she/he/it has been doubting
- we have been doubting
- you have been doubting
- they have been doubting
Negative
- I have not been doubting
- you have not been doubting
- she/he/it has not been doubting
- we have not been doubting
- you have not been doubting
- they have not been doubting
Interrogative
- have I been doubting ?
- have you been doubting ?
- has she/he/it been doubting ?
- have we been doubting ?
- have you been doubting ?
- have they been doubting ?
Negative - Interrogative
- have I not been doubting ?
- have you not been doubting ?
- has she/he/it not been doubting ?
- have we not been doubting ?
- have you not been doubting ?
- have they not been doubting ?
PAST PERFECT
Affirmative
- I had doubted
- you had doubted
- she/he/it had doubted
- we had doubted
- you had doubted
- they had doubted
Negative
- I had not doubted
- you had not doubted
- she/he/it had not doubted
- we had not doubted
- you had not doubted
- they had not doubted
Interrogative
- had I doubted ?
- had you doubted ?
- had she/he/it doubted ?
- had we doubted ?
- had you doubted ?
- had they doubted ?
Negative - Interrogative
- had I not doubted ?
- had you not doubted ?
- had she/he/it not doubted ?
- had we not doubted ?
- had you not doubted ?
- had they not doubted ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been doubting
- you had been doubting
- she/he/it had been doubting
- we had been doubting
- you had been doubting
- they had been doubting
Negative
- I had not been doubting
- you had not been doubting
- she/he/it had not been doubting
- we had not been doubting
- you had not been doubting
- they had not been doubting
Interrogative
- had I been doubting ?
- had you been doubting ?
- had she/he/it been doubting ?
- had we been doubting ?
- had you been doubting ?
- had they been doubting ?
Negative - Interrogative
- had I not been doubting ?
- had you not been doubting ?
- had she/he/it not been doubting ?
- had we not been doubting ?
- had you not been doubting ?
- had they not been doubting ?