| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] [noun] | 453 |
|
| 2 | [prep] a [adj] period [prep] [noun] | 430 |
|
| 3 | [prep] a [adj] period [prep] [noun sg] | 409 |
|
| 4 | [prep] a [adj] period of [noun] | 384 |
|
| 5 | [prep] a [adj] period [prep] time | 283 |
|
| 6 | [prep] a [adj] period [prep] time | 283 |
|
| 7 | for a [adj] period [prep] [noun] | 154 |
|
| 8 | for a [adj] period [prep] [noun] | 154 |
|
| 9 | over a [adj] period [prep] [noun] | 141 |
|
| 10 | over a [adj] period [prep] [noun] | 141 |
|
| 11 | [prep] a long period [prep] [noun] | 134 |
|
| 12 | [prep] a long period [prep] [noun] | 122 |
|
| 13 | [prep] a short period [prep] [noun] | 68 |
|
| 14 | [prep] a short period [prep] [noun] | 62 |
|
| 15 | after a [adj] period [prep] [noun] | 50 |
|
| 16 | after a [adj] period [prep] [noun] | 50 |
|
| 17 | [prep] a [adj] period [prep] [noun prp] | 31 |
|
| 18 | [prep] a [adj -er] period [prep] [noun] | 23 |
|
| 19 | [prep] a fixed period [prep] [noun] | 21 |
|
| 20 | within a [adj] period [prep] [noun] | 21 |
|
| 21 | within a [adj] period [prep] [noun] | 21 |
|
| 22 | [prep] a fixed period [prep] [noun] | 21 |
|
| 23 | [prep] a [adj] period in [noun] | 21 |
|
| 24 | in a [adj] period [prep] [noun] | 20 |
|
| 25 | in a [adj] period [prep] [noun] | 20 |
|
| 26 | [prep] a brief period [prep] [noun] | 19 |
|
| 27 | [prep] a brief period [prep] [noun] | 19 |
|
| 28 | [prep] a certain period [prep] [noun] | 19 |
|
| 29 | [prep] a certain period [prep] [noun] | 19 |
|
| 30 | [prep] a considerable period [prep] [noun] | 17 |
|
