| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] [prep] long period of | 6 |
|
| 2 | [adv] [prep] [art] long period of | 15 |
|
| 3 | [adv] [prep] a long period of | 15 |
|
| 4 | [adv] [prep] [art] long period of | 15 |
|
| 5 | [adv] [prep] a long period of | 15 |
|
| 6 | [adv] [prep] long period of [noun] | 10 |
|
| 7 | [adv] [prep] long period of [noun sg] | 10 |
|
| 8 | [adv] [prep] long period of time | 8 |
|
| 9 | [adv] [prep] long period of time | 8 |
|
