| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [verb] | 27055 |
|
| 2 | [prep] [art] [noun] [v-ing] | 23532 |
|
| 3 | [prep] [art] [noun] [v-ing] | 23532 |
|
| 4 | [prep] a [noun] [v-ing] | 6804 |
|
