| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] for a | 487 |
|
| 2 | [prep] [v-ing] a [num] | 168 |
|
| 3 | [prep] [v-ing] for [num] | 160 |
|
| 4 | [v-ing] for a [num] | 68 |
|
