| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [modal v] be [v-ing] | 401 |
|
| 2 | [conj] [modal v] be [v-ing] | 375 |
|
| 3 | [conj] [Wh pn] be [v-ing] | 203 |
|
| 4 | [conj] [Wh pn] [modal v] be | 118 |
|
