| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] is [prep] | 34 |
|
| 2 | is [vb pp] be in | 12 |
|
| 3 | is [vb pp] be for | 8 |
|
| 4 | is needed be [prep] | 6 |
|
