| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period of time | 319 |
|
| 2 | a long period of time | 115 |
|
| 3 | a long period of time | 102 |
|
| 4 | a short period of time | 54 |
|
| 5 | a short period of time | 50 |
|
| 6 | a considerable period of time | 20 |
|
| 7 | a considerable period of time | 20 |
|
| 8 | a certain period of time | 19 |
|
| 9 | a certain period of time | 19 |
|
| 10 | a fixed period of time | 18 |
|
| 11 | a [adj -er] period of time | 18 |
|
| 12 | a fixed period of time | 18 |
|
| 13 | a limited period of time | 18 |
|
| 14 | a limited period of time | 18 |
|
| 15 | a given period of time | 14 |
|
| 16 | a given period of time | 14 |
|
| 17 | a longer period of time | 13 |
|
| 18 | a prolonged period of time | 11 |
|
| 19 | a prolonged period of time | 11 |
|
| 20 | a reasonable period of time | 10 |
|
| 21 | a reasonable period of time | 10 |
|
| 22 | a specified period of time | 9 |
|
| 23 | a specified period of time | 9 |
|
| 24 | a particular period of time | 7 |
|
| 25 | a particular period of time | 7 |
|
| 26 | a specific period of time | 5 |
|
| 27 | a specific period of time | 5 |
|
