| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [to-vb] [prep] | 3831 |
|
| 2 | be [v-ing] [to-vb] [is] | 260 |
|
| 3 | be [v-ing] [is] [prep] | 38 |
|
| 4 | [v-ing] [to-vb] [is] [prep] | 13 |
|
