| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] a period | 75 |
|
| 2 | [verb] [adv prt] [art] period | 75 |
|
| 3 | [verb] over [art] period | 67 |
|
| 4 | [verb] over [art] period | 67 |
|
| 5 | [vb past] [adv] [art] period | 27 |
|
| 6 | [v-ing] [adv] [art] period | 19 |
|
| 7 | [verb] [adv] the period | 13 |
|
| 8 | [verb] [adv] [art] period | 11 |
|
| 9 | [vb base] [adv] [art] period | 10 |
|
| 10 | [vb -s] [adv] [art] period | 10 |
|
| 11 | [vb infin] [adv] [art] period | 10 |
|
| 12 | occur [adv] [art] period | 7 |
|
| 13 | [to-vb] [adv] [art] period | 6 |
|
| 14 | [vb pp] [adv] [art] period | 6 |
|
| 15 | extend [adv] [art] period | 5 |
|
