| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a | 27362 |
|
| 2 | [am/are] [v-ing] [prep] | 22320 |
|
| 3 | [am/are] [v-ing] a | 3577 |
|
| 4 | [am/are] [prep] a | 2257 |
|
