| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but they [modal v] [be] used | 7 |
|
| 2 | but they [vb mod] [be] used | 7 |
|
| 3 | but they [be] [adv] used | 12 |
|
| 4 | but they [be] [adv] used | 9 |
|
