| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [verb] been several attempts | 7 |
|
| 2 | there [verb] been several attempts | 7 |
|
| 3 | there [verb] been several attempts | 7 |
|
| 4 | [ex0] [verb] been several attempts | 7 |
|
| 5 | [verb] been several attempts [to-vb] | 6 |
|
| 6 | [verb] been several attempts [verb] | 6 |
|
