| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] teachers ' | 16 |
|
| 2 | [v-ing] teachers ' | 15 |
|
| 3 | [vb infin] teachers ' | 10 |
|
| 4 | [vb base] teachers ' | 5 |
|
