| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [adv] be | 4839 |
|
| 2 | [modal v] [adv] be [v-ing] | 1630 |
|
| 3 | it [modal v] be [v-ing] | 536 |
|
| 4 | it [modal v] [adv] [v-ing] | 5 |
|
