| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun] of time | 1642 |
|
| 2 | a [noun sg] of time | 1640 |
|
| 3 | a period of [noun] | 911 |
|
| 4 | a period of [noun sg] | 771 |
|
| 5 | [art] period of time | 327 |
|
| 6 | a period [prep] time | 285 |
|
| 7 | a period [prep] time | 285 |
|
| 8 | a period of time | 285 |
|
| 9 | a period of time | 285 |
|
| 10 | a period of time | 285 |
|
