| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [vb mod] | 32 |
|
| 2 | a [adj] period [modal v] | 26 |
|
| 3 | a long period [modal v] | 10 |
|
| 4 | a [adj] period will | 10 |
|
| 5 | a [adj] period will | 10 |
|
| 6 | a [adj] period may | 9 |
|
| 7 | a [adj] period may | 9 |
|
| 8 | a [adj -er] period [modal v] | 6 |
|
| 9 | a longer period [modal v] | 5 |
|
| 10 | a long period [modal v] | 5 |
|
