| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] to be [v-ing] | 421 |
|
| 2 | [adv] [vb past] to be [v-ing] | 90 |
|
| 3 | [adv] happen to be [v-ing] | 14 |
|
| 4 | [adv] happened to be [verb] | 14 |
|
| 5 | [adv] happened to [be] [v-ing] | 9 |
|
| 6 | [adv] happened [prep] be [v-ing] | 9 |
|
| 7 | [adv] happened to be [v-ing] | 9 |
|
