| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] happen to be [prep] | 97 |
|
| 2 | [pron] happen to be [v-ing] | 94 |
|
| 3 | happen to be [v-ing] [prep] | 51 |
|
| 4 | [pron] to be [v-ing] [prep] | 38 |
|
