| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [prep] | 70803 |
|
| 2 | is [vb pp] be | 818 |
|
| 3 | [vb pp] be [prep] | 715 |
|
| 4 | is be [prep] | 57 |
|
