| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] on [prep] [art] | 440 |
|
| 2 | [be] [v-ing] [prep] [art] time | 136 |
|
| 3 | [v-ing] on [prep] [art] time | 13 |
|
