| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] | 7113 |
|
| 2 | [pron] could be [vb pp] | 3610 |
|
| 3 | [pron] be [vb pp] [prep] | 472 |
|
| 4 | [pron] could be [prep] | 381 |
|
| 5 | [pron] could [vb pp] [prep] | 6 |
|
