| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a | 97581 |
|
| 2 | is [vb pp] [prep] | 70805 |
|
| 3 | is [prep] a | 3196 |
|
| 4 | is [vb pp] a | 888 |
|
