| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a [adj] period of | 153 |
|
| 2 | [verb] [prep] a [adj] period of | 145 |
|
| 3 | [verb] [prep] a long [noun] of | 112 |
|
| 4 | [verb] [prep] a long period [prep] | 38 |
|
| 5 | [verb] [prep] a long period [prep] | 38 |
|
| 6 | [verb] [prep] a long period of | 34 |
|
| 7 | [verb] [prep] [art] long period of | 33 |
|
| 8 | [verb] [prep] a long period of | 31 |
|
