| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] time | 357 |
|
| 2 | a long period [prep] time | 115 |
|
| 3 | a longer [noun] [prep] time | 19 |
|
| 4 | a longer period [prep] [noun] | 19 |
|
| 5 | a longer [noun sg] [prep] time | 19 |
|
| 6 | a [adj -er] period [prep] time | 18 |
|
| 7 | [art] longer period [prep] time | 13 |
|
| 8 | a longer period [prep] time | 13 |
|
| 9 | a longer period [prep] time | 13 |
|
