| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [be] [v-ing] [prep] a | 543 |
|
| 2 | [be] [v-ing] [prep] a long | 55 |
|
| 3 | [verb] [be] [prep] a long | 24 |
|
| 4 | [verb] [be] [v-ing] a long | 15 |
|
