| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [to-vb] [is] [verb] | 102 |
|
| 2 | [be] [verb] [to-vb] [is] [vb infin] | 48 |
|
| 3 | [be] [v-ing] [to-vb] [be] [vb infin] | 44 |
|
| 4 | [be] [v-ing] [verb] [is] [vb infin] | 41 |
|
