| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be [verb] | 16298 |
|
| 2 | may be [v-ing] | 1195 |
|
| 3 | [modal v] be operating | 63 |
|
| 4 | [vb mod] be operating | 63 |
|
| 5 | may be operate | 12 |
|
| 6 | may [be] operating | 11 |
|
| 7 | may be operating | 11 |
|
| 8 | may be operating | 11 |
|
| 9 | may [be] operating | 11 |
|
