| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [pron] [verb] | 7891 |
|
| 2 | [is] [pron] [vb past] | 434 |
|
| 3 | [is] [pron] happen | 280 |
|
| 4 | [be] [pron] happened | 165 |
|
