| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be [v-ing] [adv] a | 44 |
|
| 2 | [prep] be [verb] [adv] a | 40 |
|
| 3 | [prep] be [v-ing] [adv] [art] | 23 |
|
| 4 | [prep] [be] [v-ing] [adv] a | 13 |
|
