| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] to [be] [v-ing] | 685 |
|
| 2 | [adv] [vb past] to [be] [v-ing] | 91 |
|
| 3 | [adv] happen to [be] [v-ing] | 14 |
|
| 4 | [adv] happened to [be] [verb] | 14 |
|
| 5 | [adv] happened [prep] [be] [v-ing] | 9 |
|
