| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [is] [vb pp] to [be] [v-ing] | 9 |
|
| 2 | [Wh pn] [is] [vb pp] to be [v-ing] | 9 |
|
| 3 | [Wh pn] [is] [vb pp] to [be] [v-ing] | 9 |
|
| 4 | [Wh pn] [is] [vb pp] to be [v-ing] | 9 |
|
