| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [det] [is] [v-ing] | 13 |
|
| 2 | it is [det] [is] [v-ing] | 12 |
|
| 3 | it be that [is] [v-ing] | 11 |
|
| 4 | it be [det] is [v-ing] | 7 |
|
| 5 | it be [det] 's [v-ing] | 6 |
|
