| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [modal v] [vb infin] | 513 |
|
| 2 | is [v-ing] [modal v] | 53 |
|
| 3 | is [modal v] [vb infin] | 53 |
|
| 4 | is [v-ing] [vb infin] | 10 |
|
