| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] a | 6866 |
|
| 2 | [conj] [v-ing] [prep] a | 1923 |
|
| 3 | [conj] be [v-ing] [prep] | 1634 |
|
| 4 | [conj] be [prep] a | 301 |
|
| 5 | [conj] be [v-ing] a | 280 |
|
