| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [v-ing] [prep] | 15735 |
|
| 2 | [subord] [v-ing] [prep] | 5897 |
|
| 3 | [is] [subord] [prep] | 388 |
|
| 4 | [is] [subord] [v-ing] | 32 |
|
