SIMPLE PRESENT
Affirmative
- I concentrate
- you concentrate
- she/he/it concentrates
- we concentrate
- you concentrate
- they concentrate
Negative
- I do not concentrate
- you do not concentrate
- she/he/it does not concentrate
- we do not concentrate
- you do not concentrate
- they do not concentrate
Interrogative
- do I concentrate ?
- do you concentrate ?
- does she/he/it concentrate ?
- do we concentrate ?
- do you concentrate ?
- do they concentrate ?
Negative - Interrogative
- do I not concentrate ?
- do you not concentrate ?
- does she/he/it not concentrate ?
- do we not concentrate ?
- do you not concentrate ?
- do they not concentrate ?
PRESENT CONTINUOUS
Affirmative
- I am concentrating
- you are concentrating
- she/he/it is concentrating
- we are concentrating
- you are concentrating
- they are concentrating
Negative
- I am not concentrating
- you are not concentrating
- she/he/it is not concentrating
- we are not concentrating
- you are not concentrating
- they are not concentrating
Interrogative
- am I concentrating ?
- are you concentrating ?
- is she/he/it concentrating ?
- are we concentrating ?
- are you concentrating ?
- are they concentrating ?
Negative - Interrogative
- am I not concentrating ?
- are you not concentrating ?
- is she/he/it not concentrating ?
- are we not concentrating ?
- are you not concentrating ?
- are they not concentrating ?
SIMPLE PAST
Affirmative
- I concentrated
- you concentrated
- she/he/it concentrated
- we concentrated
- you concentrated
- they concentrated
Negative
- I did not concentrate
- you did not concentrate
- she/he/it did not concentrate
- we did not concentrate
- you did not concentrate
- they did not concentrate
Interrogative
- did I concentrate ?
- did you concentrate ?
- did she/he/it concentrate ?
- did we concentrate ?
- did you concentrate ?
- did they concentrate ?
Negative - Interrogative
- did I not concentrate ?
- did you not concentrate ?
- did she/he/it not concentrate ?
- did we not concentrate ?
- did you not concentrate ?
- did they not concentrate ?
PRESENT PERFECT
Affirmative
- I have concentrated
- you have concentrated
- she/he/it has concentrated
- we have concentrated
- you have concentrated
- they have concentrated
Negative
- I have not concentrated
- you have not concentrated
- she/he/it has not concentrated
- we have not concentrated
- you have not concentrated
- they have not concentrated
Interrogative
- have I concentrated ?
- have you concentrated ?
- has she/he/it concentrated ?
- have we concentrated ?
- have you concentrated ?
- have they concentrated ?
Negative - Interrogative
- have I not concentrated ?
- have you not concentrated ?
- has she/he/it not concentrated ?
- have we not concentrated ?
- have you not concentrated ?
- have they not concentrated ?
PAST CONTINUOUS
Affirmative
- I was concentrating
- you were concentrating
- she/he/it was concentrating
- we were concentrating
- you were concentrating
- they were concentrating
Negative
- I was not concentrating
- you were not concentrating
- she/he/it was not concentrating
- you were not concentrating
- you were not concentrating
- they were not concentrating
Interrogative
- was I concentrating ?
- were you concentrating ?
- was she/he/it concentrating ?
- were we concentrating ?
- were you concentrating ?
- were they concentrating ?
Negative - Interrogative
- was I not concentrating ?
- were you not concentrating ?
- was she/he/it not concentrating ?
- were we not concentrating ?
- were you not concentrating ?
- were they not concentrating ?
PRESENT PERFECT CONTINUOUS
Affirmative
- I have been concentrating
- you have been concentrating
- she/he/it has been concentrating
- we have been concentrating
- you have been concentrating
- they have been concentrating
Negative
- I have not been concentrating
- you have not been concentrating
- she/he/it has not been concentrating
- we have not been concentrating
- you have not been concentrating
- they have not been concentrating
Interrogative
- have I been concentrating ?
- have you been concentrating ?
- has she/he/it been concentrating ?
- have we been concentrating ?
- have you been concentrating ?
- have they been concentrating ?
Negative - Interrogative
- have I not been concentrating ?
- have you not been concentrating ?
- has she/he/it not been concentrating ?
- have we not been concentrating ?
- have you not been concentrating ?
- have they not been concentrating ?
PAST PERFECT
Affirmative
- I had concentrated
- you had concentrated
- she/he/it had concentrated
- we had concentrated
- you had concentrated
- they had concentrated
Negative
- I had not concentrated
- you had not concentrated
- she/he/it had not concentrated
- we had not concentrated
- you had not concentrated
- they had not concentrated
Interrogative
- had I concentrated ?
- had you concentrated ?
- had she/he/it concentrated ?
- had we concentrated ?
- had you concentrated ?
- had they concentrated ?
Negative - Interrogative
- had I not concentrated ?
- had you not concentrated ?
- had she/he/it not concentrated ?
- had we not concentrated ?
- had you not concentrated ?
- had they not concentrated ?
PAST PERFECT CONTINUOUS
Affirmative
- I had been concentrating
- you had been concentrating
- she/he/it had been concentrating
- we had been concentrating
- you had been concentrating
- they had been concentrating
Negative
- I had not been concentrating
- you had not been concentrating
- she/he/it had not been concentrating
- we had not been concentrating
- you had not been concentrating
- they had not been concentrating
Interrogative
- had I been concentrating ?
- had you been concentrating ?
- had she/he/it been concentrating ?
- had we been concentrating ?
- had you been concentrating ?
- had they been concentrating ?
Negative - Interrogative
- had I not been concentrating ?
- had you not been concentrating ?
- had she/he/it not been concentrating ?
- had we not been concentrating ?
- had you not been concentrating ?
- had they not been concentrating ?