| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] [prep] | 27424 |
|
| 2 | [v-ing] on [prep] | 3709 |
|
| 3 | [was/were] [v-ing] on | 1359 |
|
| 4 | [was/were] on [prep] | 286 |
|
