| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [vb pp] [prep] | 4737 |
|
| 2 | is sometimes [vb pp] [prep] | 291 |
|
| 3 | it is sometimes [vb pp] | 205 |
|
| 4 | it is sometimes [prep] | 7 |
|
