| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [be] [adv] [v-ing] | 1441 |
|
| 2 | [be] once [adv] [v-ing] | 85 |
|
| 3 | [conj] [be] once [adv] | 27 |
|
| 4 | [conj] once [adv] [v-ing] | 6 |
|
