| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] have been taking | 11 |
|
| 2 | who [verb] been taking | 11 |
|
| 3 | [Wh pn] [vb past] been taking | 8 |
|
| 4 | [Wh pn] had been taking | 7 |
|
