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 ?