| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] [pron] [vb mod] | 51 |
|
| 2 | [is] [verb] [prep] [pron] [vb mod] | 40 |
|
| 3 | [is] [v-ing] [prep] [pron] [modal v] | 10 |
|
