| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be used for this | 23 |
|
| 2 | [modal v] be used for this | 23 |
|
| 3 | could be used for this | 7 |
|
| 4 | could be used for this | 7 |
|
| 5 | can be used for this | 6 |
|
| 6 | can be used for this | 6 |
|
