| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [adj] period [modal v] [adv] [vb infin] | 6 |
|
| 2 | [art] [adj] period [modal v] [adv] [vb infin] | 6 |
|
| 3 | the [adj] period [modal v] [adv] [vb infin] | 5 |
|
| 4 | the [adj] period [modal v] [adv] [vb infin] | 5 |
|
