| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] a long period | 31 |
|
| 2 | [vb past] [adv] a long period | 8 |
|
| 3 | [vb -s] [adv] a long period | 7 |
|
| 4 | [prep] [adv] a long period | 6 |
|
| 5 | [prep] [adv] a long period | 6 |
|
| 6 | [v-ing] [adv] a long period | 5 |
|
| 7 | [adv] [prep] a long period | 36 |
|
| 8 | [adv] [prep] a long period | 36 |
|
| 9 | [adv] over a long period | 22 |
|
| 10 | [adv] over a long period | 22 |
|
| 11 | [adv] for a long period | 7 |
|
| 12 | [adv] for a long period | 7 |
|
| 13 | [adv] [verb] a long period | 6 |
|
| 14 | [adv] a [adv] long period | 5 |
|
| 15 | [adv] a [adv] long period | 5 |
|
| 16 | [adv] a long period [prep] | 13 |
|
| 17 | [adv] a long period [prep] | 13 |
|
| 18 | [adv] a long period of | 12 |
|
| 19 | [adv] a long period of | 12 |
|
