| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] appear [prep] first | 15 |
|
| 2 | [modal v] appear [prep] first | 15 |
|
| 3 | [modal v] appear at first | 12 |
|
| 4 | [modal v] appear at first | 12 |
|
| 5 | may appear [prep] first | 10 |
|
| 6 | may appear [prep] first | 10 |
|
