| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a long period | 30 |
|
| 2 | [verb] [adv prt] a long period | 28 |
|
| 3 | [vb past] [adv prt] a long period | 8 |
|
| 4 | [vb -s] [adv prt] a long period | 7 |
|
| 5 | [v-ing] [adv prt] a long period | 5 |
|
