| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 1820 |
|
| 2 | [prep] a [adj] period | 1820 |
|
| 3 | for a [adj] period | 691 |
|
| 4 | for a [adj] period | 691 |
|
| 5 | over a [adj] period | 488 |
|
| 6 | over a [adj] period | 488 |
|
| 7 | [verb] a [adj] period | 244 |
|
| 8 | [adv] a [adj] period | 147 |
|
| 9 | after a [adj] period | 124 |
|
| 10 | after a [adj] period | 124 |
|
| 11 | [be] a [adj] period | 116 |
|
| 12 | be a [adj] period | 116 |
|
| 13 | in a [adj] period | 100 |
|
| 14 | in a [adj] period | 100 |
|
| 15 | within a [adj] period | 94 |
|
| 16 | within a [adj] period | 94 |
|
| 17 | [adv prt] a [adj] period | 81 |
|
| 18 | over a [adj] period | 77 |
|
| 19 | over a [adj] period | 77 |
|
| 20 | [conj] a [adj] period | 73 |
|
| 21 | during a [adj] period | 68 |
|
| 22 | during a [adj] period | 68 |
|
| 23 | of a [adj] period | 62 |
|
| 24 | of a [adj] period | 62 |
|
| 25 | [vb past] a [adj] period | 61 |
|
| 26 | [adv] a [adj] period | 60 |
|
| 27 | [v-ing] a [adj] period | 43 |
|
| 28 | [was/were] a [adj] period | 39 |
|
| 29 | was a [adj] period | 37 |
|
| 30 | [adj] a [adj] period | 36 |
|
