| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be on call [prep] | 17 |
|
| 2 | be call [prep] [noun] | 12 |
|
| 3 | on call [prep] [noun] | 10 |
|
| 4 | be on [prep] [noun] | 6 |
|
