| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i 've been [verb] on | 37 |
|
| 2 | i 've been [v-ing] on | 33 |
|
| 3 | i [vb base] been concentrating on | 7 |
|
| 4 | i have been concentrating on | 7 |
|
| 5 | [pers pn] 've been concentrating on | 7 |
|
| 6 | i [verb] been concentrating on | 7 |
|
| 7 | [pron] 've been concentrating on | 7 |
|
| 8 | i 've [been] concentrating on | 6 |
|
| 9 | i 've been concentrating on | 6 |
|
| 10 | i 've been concentrating [prep] | 6 |
|
| 11 | i 've be concentrating on | 6 |
|
| 12 | i 've been concentrating on | 6 |
|
| 13 | i 've been concentrate on | 6 |
|
| 14 | i 've been concentrating [prep] | 6 |
|
| 15 | i 've [be] concentrating on | 6 |
|
