| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] [conj] it is [v-ing] | 7 |
|
| 2 | [modal v] [vb infin] [conj] it is [v-ing] | 7 |
|
| 3 | [vb infin] [adv] [conj] it is [v-ing] | 5 |
|
