| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be used for | 54 |
|
| 2 | may [vb infin] be used | 35 |
|
| 3 | [vb infin] be used for | 24 |
|
| 4 | may [vb infin] be for | 10 |
|
