| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] [be] [verb] | 2765 |
|
| 2 | may [adv] [be] [vb pp] | 2454 |
|
| 3 | [modal v] [adv] [be] observed | 70 |
|
| 4 | [vb mod] [adv] [be] observed | 70 |
|
| 5 | may [adv] [be] observe | 21 |
|
| 6 | may [adv] [be] observed | 21 |
|
| 7 | may [adv] [be] observed | 21 |
|
