| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [modal v] [vb infin] a [adj] period | 5 |
|
| 2 | [modal v] [adv] [vb infin] a [adj] period | 6 |
|
| 3 | [modal v] [adv] [vb infin] a [adj] period | 6 |
|
| 4 | [modal v] [vb infin] [prep] a [adj] period | 21 |
|
| 5 | [modal v] [vb infin] [prep] a [adj] period | 21 |
|
| 6 | [modal v] [vb infin] for a [adj] period | 15 |
|
| 7 | [modal v] [vb infin] for a [adj] period | 15 |
|
| 8 | [modal v] [vb infin] [adv] a [adj] period | 6 |
|
| 9 | [modal v] [vb infin] a [adj] period [prep] | 5 |
|
| 10 | [modal v] [vb infin] a [adj] period [prep] | 5 |
|
