| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period [prep] [noun] | 37 |
|
| 2 | [adv] a [adj] period [prep] [noun sg] | 33 |
|
| 3 | [adv] a [adj] period of [noun] | 33 |
|
| 4 | [adv] a [adj] period of [noun] | 33 |
|
| 5 | [adv] a [adj] period [prep] time | 28 |
|
| 6 | [adv] a [adj] period [prep] time | 28 |
|
| 7 | [adv prt] a [adj] period [prep] [noun] | 19 |
|
| 8 | over a [adj] period [prep] [noun] | 19 |
|
| 9 | over a [adj] period [prep] [noun] | 19 |
|
| 10 | [adv] a [adj] period [prep] [noun] | 17 |
|
| 11 | [adv] a long period [prep] [noun] | 12 |
|
| 12 | only a [adj] period [prep] [noun] | 9 |
|
| 13 | only a [adj] period [prep] [noun] | 9 |
|
| 14 | [adv] a short period [prep] [noun] | 8 |
|
