SIMPLE PRESENT
Affirmative
- I concenter
- you concenter
- she/he/it concenters
- we concenter
- you concenter
- they concenter
Negative
- I do not concenter
- you do not concenter
- she/he/it does not concenter
- we do not concenter
- you do not concenter
- they do not concenter
Interrogative
- do I concenter ?
- do you concenter ?
- does she/he/it concenter ?
- do we concenter ?
- do you concenter ?
- do they concenter ?
Negative - Interrogative
- do I not concenter ?
- do you not concenter ?
- does she/he/it not concenter ?
- do we not concenter ?
- do you not concenter ?
- do they not concenter ?
PRESENT CONTINUOUS
Affirmative
- I am concentering
- you are concentering
- she/he/it is concentering
- we are concentering
- you are concentering
- they are concentering
Negative
- I am not concentering
- you are not concentering
- she/he/it is not concentering
- we are not concentering
- you are not concentering
- they are not concentering
Interrogative
- am I concentering ?
- are you concentering ?
- is she/he/it concentering ?
- are we concentering ?
- are you concentering ?
- are they concentering ?
Negative - Interrogative
- am I not concentering ?
- are you not concentering ?
- is she/he/it not concentering ?
- are we not concentering ?
- are you not concentering ?
- are they not concentering ?
SIMPLE PAST
Affirmative
- I concentered
- you concentered
- she/he/it concentered
- we concentered
- you concentered
- they concentered
Negative
- I did not concenter
- you did not concenter
- she/he/it did not concenter
- we did not concenter
- you did not concenter
- they did not concenter
Interrogative
- did I concenter ?
- did you concenter ?
- did she/he/it concenter ?
- did we concenter ?
- did you concenter ?
- did they concenter ?
Negative - Interrogative
- did I not concenter ?
- did you not concenter ?
- did she/he/it not concenter ?
- did we not concenter ?
- did you not concenter ?
- did they not concenter ?
PRESENT PERFECT
Affirmative
- I have concentered
- you have concentered
- she/he/it has concentered
- we have concentered
- you have concentered
- they have concentered
Negative
- I have not concentered
- you have not concentered
- she/he/it has not concentered
- we have not concentered
- you have not concentered
- they have not concentered
Interrogative
- have I concentered ?
- have you concentered ?
- has she/he/it concentered ?
- have we concentered ?
- have you concentered ?
- have they concentered ?
Negative - Interrogative
- have I not concentered ?
- have you not concentered ?
- has she/he/it not concentered ?
- have we not concentered ?
- have you not concentered ?
- have they not concentered ?
PAST CONTINUOUS
Affirmative
- I was concentering
- you were concentering
- she/he/it was concentering
- we were concentering
- you were concentering
- they were concentering
Negative
- I was not concentering
- you were not concentering
- she/he/it was not concentering
- you were not concentering
- you were not concentering
- they were not concentering
Interrogative
- was I concentering ?
- were you concentering ?
- was she/he/it concentering ?
- were we concentering ?
- were you concentering ?
- were they concentering ?
Negative - Interrogative
- was I not concentering ?
- were you not concentering ?
- was she/he/it not concentering ?
- were we not concentering ?
- were you not concentering ?
- were they not concentering ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been concentering
- you have been concentering
- she/he/it has been concentering
- we have been concentering
- you have been concentering
- they have been concentering
Negative
- I have not been concentering
- you have not been concentering
- she/he/it has not been concentering
- we have not been concentering
- you have not been concentering
- they have not been concentering
Interrogative
- have I been concentering ?
- have you been concentering ?
- has she/he/it been concentering ?
- have we been concentering ?
- have you been concentering ?
- have they been concentering ?
Negative - Interrogative
- have I not been concentering ?
- have you not been concentering ?
- has she/he/it not been concentering ?
- have we not been concentering ?
- have you not been concentering ?
- have they not been concentering ?
PAST PERFECT
Affirmative
- I had concentered
- you had concentered
- she/he/it had concentered
- we had concentered
- you had concentered
- they had concentered
Negative
- I had not concentered
- you had not concentered
- she/he/it had not concentered
- we had not concentered
- you had not concentered
- they had not concentered
Interrogative
- had I concentered ?
- had you concentered ?
- had she/he/it concentered ?
- had we concentered ?
- had you concentered ?
- had they concentered ?
Negative - Interrogative
- had I not concentered ?
- had you not concentered ?
- had she/he/it not concentered ?
- had we not concentered ?
- had you not concentered ?
- had they not concentered ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been concentering
- you had been concentering
- she/he/it had been concentering
- we had been concentering
- you had been concentering
- they had been concentering
Negative
- I had not been concentering
- you had not been concentering
- she/he/it had not been concentering
- we had not been concentering
- you had not been concentering
- they had not been concentering
Interrogative
- had I been concentering ?
- had you been concentering ?
- had she/he/it been concentering ?
- had we been concentering ?
- had you been concentering ?
- had they been concentering ?
Negative - Interrogative
- had I not been concentering ?
- had you not been concentering ?
- had she/he/it not been concentering ?
- had we not been concentering ?
- had you not been concentering ?
- had they not been concentering ?