| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the period he [modal v] serve | 5 |
|
| 2 | [prep] the period he [modal v] serve | 5 |
|
| 3 | the period he [modal v] serve [prep] | 5 |
|
| 4 | the period he [modal v] serve [prep] | 5 |
|
