| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | 've been doing [pron] [prep] a | 5 |
|
| 2 | 've been doing it [prep] a | 5 |
|
| 3 | 've been doing it [prep] a | 5 |
|
| 4 | 've been doing [pers pn] [prep] a | 5 |
|
