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