| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [verb] on a | 561 |
|
| 2 | [modal v] [be] [v-ing] [prep] a | 394 |
|
| 3 | [modal v] [be] [v-ing] [prep] a | 394 |
|
| 4 | [modal v] [be] [v-ing] on [art] | 148 |
|
| 5 | [modal v] [be] [v-ing] on [art] | 148 |
|
| 6 | [modal v] [be] [v-ing] on a | 35 |
|
| 7 | [modal v] [be] [v-ing] on a | 35 |
|
