| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] a [noun] [prep] | 1060 |
|
| 2 | [v-ing] on a [noun] [prep] | 486 |
|
| 3 | [was/were] [v-ing] on a [noun] | 184 |
|
| 4 | [was/were] on a [noun] [prep] | 104 |
|
| 5 | [was/were] [v-ing] on [noun] [prep] | 88 |
|
