| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] | 71140 |
|
| 2 | [vb mod] be [v-ing] | 15842 |
|
| 3 | [vb mod] be [prep] | 14386 |
|
| 4 | [vb mod] [v-ing] [prep] | 18 |
|
