| CONCENTRATE - PRESENT CONTINUOUS | |
| ★ i am | concentrating |
| ★ you are | concentrating |
| ★ he/she/it is | concentrating |
| ★ we are | concentrating |
| ★you are | concentrating |
| ★ they are | concentrating |
| CONCENTRATE - PRESENT PERFECT | |
| ★ i have | concentrated |
| ★ you have | concentrated |
| ★ he/she/it has | concentrated |
| ★ we have | concentrated |
| ★ you have | concentrated |
| ★ they have | concentrated |
| CONCENTRATE - PRESENT PERFECT CONTINUOUS | |
| ★ i have been | concentrating |
| ★ you have been | concentrating |
| ★ he/she/it has been | concentrating |
| ★ we have been | concentrating |
| ★ you have been | concentrating |
| ★ they have been | concentrating |