| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be obtained by | 220 |
|
| 2 | [vb mod] be obtained by | 220 |
|
| 3 | [vb mod] [be] obtained by | 220 |
|
| 4 | can [be] obtained by | 143 |
|
| 5 | may [be] obtained by | 47 |
|
| 6 | could [be] obtained by | 17 |
|
| 7 | would [be] obtained by | 5 |
|
