| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [be] [prep] [noun] | 49 |
|
| 2 | [adv] [be] explain [prep] [noun] | 32 |
|
| 3 | could [be] explain [prep] [noun] | 19 |
|
| 4 | could [adv] [be] explain [prep] | 13 |
|
