| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] a [noun] [prep] | 20681 |
|
| 2 | [v-ing] a [noun sg] [prep] | 20143 |
|
| 3 | [verb] a period [prep] | 346 |
|
| 4 | [v-ing] [art] period [prep] | 104 |
|
| 5 | [v-ing] a period [prep] | 61 |
|
