| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of time | 88 |
|
| 2 | [prep] a long period of time | 88 |
|
| 3 | over a long period of time | 71 |
|
| 4 | over a long period of time | 71 |
|
| 5 | for a long period of time | 14 |
|
| 6 | for a long period of time | 14 |
|
| 7 | [adv] a long period of time | 11 |
|
| 8 | over a long period of time | 8 |
|
| 9 | over a long period of time | 8 |
|
| 10 | [adv prt] a long period of time | 8 |
|
| 11 | a [adv] long period of time | 10 |
|
| 12 | a [adv] long period of time | 10 |
|
| 13 | a very long period of time | 5 |
|
| 14 | a very long period of time | 5 |
|
| 15 | a long period of time [conj] | 10 |
|
| 16 | a long period of time [coord] | 9 |
|
| 17 | a long period of time and | 7 |
|
| 18 | a long period of time and | 7 |
|
| 19 | a long period of time [adv] | 6 |
|
| 20 | a long period of time [verb] | 6 |
|
| 21 | a long period of time [adv] | 6 |
|
