| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [that] [prep] a period of | 7 |
|
| 2 | [that] [prep] a period of [adj] | 8 |
|
| 3 | [that] [prep] a period of [noun] | 6 |
|
| 4 | [that] [prep] a period of [noun sg] | 5 |
|
