| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] on [art] [noun] | 6 |
|
| 2 | [vb mod] be [v-ing] on [art] [noun] | 6 |
|
| 3 | be [v-ing] on [prep] [art] [noun] | 14 |
|
| 4 | be [v-ing] on [prep] [art] [noun] | 14 |
|
