| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be obtained by | 220 |
|
| 2 | can be obtained by | 143 |
|
| 3 | may be obtained by | 47 |
|
| 4 | could be obtained by | 17 |
|
| 5 | would be obtained by | 5 |
|
