| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [prep] | 70805 |
|
| 2 | [vb pp] [to-vb] [prep] | 17262 |
|
| 3 | is [vb pp] [to-vb] | 11583 |
|
| 4 | is [to-vb] [prep] | 2224 |
|
