| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [prep] | 70803 |
|
| 2 | is [vb pp] is | 691 |
|
| 3 | [vb pp] [prep] is | 165 |
|
| 4 | is [prep] is | 33 |
|
