| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] to be [v-ing] | 685 |
|
| 2 | [adv] happen to be [verb] | 27 |
|
| 3 | [adv] happen [prep] be [v-ing] | 14 |
|
| 4 | [adv] happen to [be] [v-ing] | 14 |
|
