| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] to | 603 |
|
| 2 | [Wh det] be [v-ing] to | 448 |
|
| 3 | [Wh det] [modal v] be [v-ing] | 190 |
|
| 4 | [Wh det] [modal v] be to | 15 |
|
