| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] | 79530 |
|
| 2 | [v-ing] [prep] four | 209 |
|
| 3 | [be] [prep] four | 142 |
|
| 4 | [be] [v-ing] four | 82 |
|
