| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] been [verb] | 7120 |
|
| 2 | [verb] been used [verb] | 407 |
|
| 3 | [modal v] [verb] been used | 151 |
|
| 4 | [modal v] [verb] used [verb] | 8 |
|
