| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] obtain [prep] | 65 |
|
| 2 | [Wh det] could [be] [prep] | 34 |
|
| 3 | [Wh det] [be] obtain [prep] | 21 |
|
| 4 | [Wh det] could [be] obtain | 11 |
|
