| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [noun prp] [noun] | 787 |
|
| 2 | [be] [v-ing] [noun] [letter] | 33 |
|
| 3 | [be] [verb] [noun prp] [letter] | 16 |
|
