| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be used for this purpose | 13 |
|
| 2 | [modal v] be used for this purpose | 13 |
|
| 3 | [modal v] be used for this purpose | 13 |
|
| 4 | [modal v] be used for this purpose | 13 |
|
