| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] teachers | 47 |
|
| 2 | be [vb pp] by teachers | 31 |
|
| 3 | be [vb pp] by teachers | 31 |
|
| 4 | be [vb pp] to teachers | 8 |
|
| 5 | be [vb pp] to teachers | 8 |
|
| 6 | be used [prep] teachers | 8 |
|
