| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [v-ing] [pron] | 768 |
|
| 2 | be [v-ing] [pron] a | 499 |
|
| 3 | it be [v-ing] a | 447 |
|
| 4 | it be [pron] a | 32 |
|
