| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] long period [prep] | 56 |
|
| 2 | [adv] long period [prep] | 52 |
|
| 3 | [adv] long period [prep] | 48 |
|
| 4 | [adv] long period of | 48 |
|
| 5 | [adv] long period of | 48 |
|
| 6 | [adv] long period [prep] | 29 |
|
| 7 | [adv] long periods [prep] | 27 |
|
| 8 | very long period [prep] | 13 |
|
| 9 | very long period [prep] | 13 |
|
| 10 | relatively long period [prep] | 10 |
|
| 11 | relatively long period [prep] | 10 |
|
| 12 | [adv] longer period [prep] | 8 |
|
| 13 | much long period [prep] | 7 |
|
| 14 | quite long period [prep] | 7 |
|
| 15 | quite long period [prep] | 7 |
|
| 16 | much long period [prep] | 7 |
|
