| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] | 79530 |
|
| 2 | [be] [v-ing] us | 766 |
|
| 3 | [v-ing] us [prep] | 624 |
|
| 4 | [be] us [prep] | 9 |
|
