| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period [prep] time in [pron] | 7 |
|
| 2 | period of time in [pron] | 7 |
|
| 3 | period of time in [pron] | 7 |
|
| 4 | period [prep] time in [Wh det] | 6 |
|
| 5 | period [prep] time in which | 6 |
|
| 6 | period [prep] time in which | 6 |
|
| 7 | period [prep] time in [pron] | 6 |
|
