| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [det] attempts | 21 |
|
| 2 | have been [adj] attempts | 12 |
|
| 3 | have been many attempts | 7 |
|
| 4 | have been many attempts | 7 |
|
| 5 | have been several attempts | 7 |
|
| 6 | have been several attempts | 7 |
|
| 7 | have been few attempts | 5 |
|
| 8 | have been few attempts | 5 |
|
