| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] [prep] be | 1226 |
|
| 2 | [v-ing] [pers pn] [prep] be | 305 |
|
| 3 | is [v-ing] [pers pn] [prep] | 205 |
|
| 4 | is [pers pn] [prep] be | 64 |
|
