| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] | 430262 |
|
| 2 | [prep] [noun] [v-ing] | 33828 |
|
| 3 | a [noun] [v-ing] | 15166 |
|
| 4 | [prep] a [v-ing] | 66 |
|
