I concentrate you concentrate she concentrates we concentrate you concentrate they concentrate
Present continuous
I am concentrating you are concentrating she is concentrating we are concentrating you are concentrating they are concentrating
Preterite
I concentrated you concentrated she concentrated we concentrated you concentrated they concentrated
Preterite continuous
I was concentrating you were concentrating she was concentrating we were concentrating you were concentrating they were concentrating
Present perfect
I have concentrated you have concentrated she has concentrated we have concentrated you have concentrated they have concentrated
Present perfect continuous
I have been concentrating you have been concentrating she has been concentrating we have been concentrating you have been concentrating they have been concentrating
Pluperfect
I had concentrated you had concentrated she had concentrated we had concentrated you had concentrated they had concentrated
Pluperfect continuous
I had been concentrating you had been concentrating she had been concentrating we had been concentrating you had been concentrating they had been concentrating
Future
I will concentrate you will concentrate she will concentrate we will concentrate you will concentrate they will concentrate
Future continuous
I will be concentrating you will be concentrating she will be concentrating we will be concentrating you will be concentrating they will be concentrating
Future perfect
I will have concentrated you will have concentrated she will have concentrated we will have concentrated you will have concentrated they will have concentrated
Future perfect continuous
I will have been concentrating you will have been concentrating she will have been concentrating we will have been concentrating you will have been concentrating they will have been concentrating
Conditional
Present
I would concentrate you would concentrate she would concentrate we would concentrate you would concentrate they would concentrate
Present continuous
I would be concentrating you would be concentrating she would be concentrating we would be concentrating you would be concentrating they would be concentrating
Past
I would have concentrated you would have concentrated she would have concentrated we would have concentrated you would have concentrated they would have concentrated
Past continuous
I would have been concentrating you would have been concentrating she would have been concentrating we would have been concentrating you would have been concentrating they would have been concentrating