| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [prep] a [noun] [conj] | 2669 |
|
| 2 | be [v-ing] [prep] [art] [noun] [conj] | 1505 |
|
| 3 | [be] [v-ing] [prep] a [noun] [conj] | 365 |
|
