| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [am/are] [v-ing] [prep] | 17872 |
|
| 2 | [v-ing] [prep] be | 9458 |
|
| 3 | [am/are] [prep] be | 3011 |
|
| 4 | [am/are] [v-ing] be | 976 |
|
