| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [is] to | 201 |
|
| 2 | [v-ing] [is] [prep] | 143 |
|
| 3 | [v-ing] [is] [prep] | 143 |
|
| 4 | [v-ing] [be] to | 53 |
|
| 5 | [v-ing] [is] to | 23 |
|
