| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [be] [v-ing] [prep] a [adj] | 223 |
|
| 2 | [noun] [be] [v-ing] on a [adj] | 92 |
|
| 3 | [noun prp] [be] [verb] on a [adj] | 80 |
|
| 4 | [noun prp] [be] [v-ing] on [art] [adj] | 70 |
|
