| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [to-vb] [is] | 260 |
|
| 2 | [v-ing] [to-vb] [is] [vb infin] | 44 |
|
| 3 | [be] [v-ing] [to-vb] [vb infin] | 20 |
|
