| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been missing for | 10 |
|
| 2 | [vb -s] be missing for | 10 |
|
| 3 | [vb -s] [been] missing for | 10 |
|
| 4 | has [be] missing for | 6 |
|
