| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | attempts have been | 123 |
|
| 2 | attempts have been | 98 |
|
| 3 | attempts [vb base] been | 98 |
|
| 4 | attempts had been | 25 |
|
| 5 | attempts [vb past] been | 25 |
|
