| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] | 1112 |
|
| 2 | a [adj] period of | 889 |
|
| 3 | a long period [prep] | 216 |
|
| 4 | an [adj] period [prep] | 141 |
|
| 5 | a short period [prep] | 126 |
|
| 6 | a [adj] period in | 124 |
|
| 7 | a brief period [prep] | 62 |
|
| 8 | a [adj] period for | 48 |
|
| 9 | a fixed period [prep] | 33 |
|
| 10 | a prolonged period [prep] | 32 |
|
| 11 | a limited period [prep] | 30 |
|
| 12 | a considerable period [prep] | 26 |
|
| 13 | a certain period [prep] | 26 |
|
| 14 | a reasonable period [prep] | 24 |
|
| 15 | a [adj] period after | 24 |
|
| 16 | a initial period [prep] | 23 |
|
| 17 | a lengthy period [prep] | 23 |
|
| 18 | a [adj] period during | 22 |
|
| 19 | a [adj] period at | 21 |
|
| 20 | a specified period [prep] | 21 |
|
| 21 | a extended period [prep] | 21 |
|
| 22 | a transitional period [prep] | 19 |
|
| 23 | a continuous period [prep] | 19 |
|
| 24 | a [adj] period from | 18 |
|
| 25 | a given period [prep] | 18 |
|
| 26 | a particular period [prep] | 18 |
|
| 27 | a [adj] period to | 15 |
|
| 28 | a maximum period [prep] | 14 |
|
| 29 | a new period [prep] | 13 |
|
| 30 | a [adj] period with | 12 |
|
