| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] been trying | 19 |
|
| 2 | who have [been] trying | 19 |
|
| 3 | who [verb] [been] trying | 19 |
|
| 4 | who [vb past] [been] trying | 9 |
|
| 5 | who [vb -s] [been] trying | 6 |
|
| 6 | who had [been] trying | 6 |
|
| 7 | who has [been] trying | 5 |
|
