| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [verb] a period [prep] | 25 |
|
| 2 | have [vb pp] a period [prep] | 23 |
|
| 3 | have [verb] a period of | 21 |
|
| 4 | had [verb] a period [prep] | 8 |
|
| 5 | has [verb] a period [prep] | 8 |
|
| 6 | have [verb] a period [prep] | 6 |
|
| 7 | have entered a period [prep] | 5 |
|
| 8 | have enter a period [prep] | 5 |
|
