| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] a | 6866 |
|
| 2 | [v-ing] [prep] a long | 134 |
|
| 3 | [be] [v-ing] a long | 95 |
|
| 4 | [be] [prep] a long | 66 |
|
| 5 | [be] [v-ing] [prep] long | 12 |
|
