SIMPLE PRESENT
Affirmative
- I stack
- you stack
- she/he/it stacks
- we stack
- you stack
- they stack
Negative
- I do not stack
- you do not stack
- she/he/it does not stack
- we do not stack
- you do not stack
- they do not stack
Interrogative
- do I stack ?
- do you stack ?
- does she/he/it stack ?
- do we stack ?
- do you stack ?
- do they stack ?
Negative - Interrogative
- do I not stack ?
- do you not stack ?
- does she/he/it not stack ?
- do we not stack ?
- do you not stack ?
- do they not stack ?
PRESENT CONTINUOUS
Affirmative
- I am stacking
- you are stacking
- she/he/it is stacking
- we are stacking
- you are stacking
- they are stacking
Negative
- I am not stacking
- you are not stacking
- she/he/it is not stacking
- we are not stacking
- you are not stacking
- they are not stacking
Interrogative
- am I stacking ?
- are you stacking ?
- is she/he/it stacking ?
- are we stacking ?
- are you stacking ?
- are they stacking ?
Negative - Interrogative
- am I not stacking ?
- are you not stacking ?
- is she/he/it not stacking ?
- are we not stacking ?
- are you not stacking ?
- are they not stacking ?
SIMPLE PAST
Affirmative
- I stacked
- you stacked
- she/he/it stacked
- we stacked
- you stacked
- they stacked
Negative
- I did not stack
- you did not stack
- she/he/it did not stack
- we did not stack
- you did not stack
- they did not stack
Interrogative
- did I stack ?
- did you stack ?
- did she/he/it stack ?
- did we stack ?
- did you stack ?
- did they stack ?
Negative - Interrogative
- did I not stack ?
- did you not stack ?
- did she/he/it not stack ?
- did we not stack ?
- did you not stack ?
- did they not stack ?
PRESENT PERFECT
Affirmative
- I have stacked
- you have stacked
- she/he/it has stacked
- we have stacked
- you have stacked
- they have stacked
Negative
- I have not stacked
- you have not stacked
- she/he/it has not stacked
- we have not stacked
- you have not stacked
- they have not stacked
Interrogative
- have I stacked ?
- have you stacked ?
- has she/he/it stacked ?
- have we stacked ?
- have you stacked ?
- have they stacked ?
Negative - Interrogative
- have I not stacked ?
- have you not stacked ?
- has she/he/it not stacked ?
- have we not stacked ?
- have you not stacked ?
- have they not stacked ?
PAST CONTINUOUS
Affirmative
- I was stacking
- you were stacking
- she/he/it was stacking
- we were stacking
- you were stacking
- they were stacking
Negative
- I was not stacking
- you were not stacking
- she/he/it was not stacking
- you were not stacking
- you were not stacking
- they were not stacking
Interrogative
- was I stacking ?
- were you stacking ?
- was she/he/it stacking ?
- were we stacking ?
- were you stacking ?
- were they stacking ?
Negative - Interrogative
- was I not stacking ?
- were you not stacking ?
- was she/he/it not stacking ?
- were we not stacking ?
- were you not stacking ?
- were they not stacking ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been stacking
- you have been stacking
- she/he/it has been stacking
- we have been stacking
- you have been stacking
- they have been stacking
Negative
- I have not been stacking
- you have not been stacking
- she/he/it has not been stacking
- we have not been stacking
- you have not been stacking
- they have not been stacking
Interrogative
- have I been stacking ?
- have you been stacking ?
- has she/he/it been stacking ?
- have we been stacking ?
- have you been stacking ?
- have they been stacking ?
Negative - Interrogative
- have I not been stacking ?
- have you not been stacking ?
- has she/he/it not been stacking ?
- have we not been stacking ?
- have you not been stacking ?
- have they not been stacking ?
PAST PERFECT
Affirmative
- I had stacked
- you had stacked
- she/he/it had stacked
- we had stacked
- you had stacked
- they had stacked
Negative
- I had not stacked
- you had not stacked
- she/he/it had not stacked
- we had not stacked
- you had not stacked
- they had not stacked
Interrogative
- had I stacked ?
- had you stacked ?
- had she/he/it stacked ?
- had we stacked ?
- had you stacked ?
- had they stacked ?
Negative - Interrogative
- had I not stacked ?
- had you not stacked ?
- had she/he/it not stacked ?
- had we not stacked ?
- had you not stacked ?
- had they not stacked ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been stacking
- you had been stacking
- she/he/it had been stacking
- we had been stacking
- you had been stacking
- they had been stacking
Negative
- I had not been stacking
- you had not been stacking
- she/he/it had not been stacking
- we had not been stacking
- you had not been stacking
- they had not been stacking
Interrogative
- had I been stacking ?
- had you been stacking ?
- had she/he/it been stacking ?
- had we been stacking ?
- had you been stacking ?
- had they been stacking ?
Negative - Interrogative
- had I not been stacking ?
- had you not been stacking ?
- had she/he/it not been stacking ?
- had we not been stacking ?
- had you not been stacking ?
- had they not been stacking ?