| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] period he [modal v] serve | 5 |
|
| 2 | the period he [modal v] serve | 5 |
|
| 3 | [art] period he should serve | 5 |
|
| 4 | [art] period he [modal v] serve | 5 |
|
| 5 | the period he [modal v] serve | 5 |
|
| 6 | [art] period he [vb mod] serve | 5 |
|
| 7 | [art] period he should serve | 5 |
|
