| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adv] [adj] period [prep] | 110 |
|
| 2 | a [adv] [adj] period of | 87 |
|
| 3 | a very [adj] period [prep] | 50 |
|
| 4 | a [adv] short period [prep] | 47 |
|
| 5 | a [adv] short period [prep] | 44 |
|
| 6 | a relatively [adj] period [prep] | 29 |
|
| 7 | a [adv] long period [prep] | 19 |
|
| 8 | a [adv] long period [prep] | 14 |
|
| 9 | a [adv] [adj] period in | 13 |
|
| 10 | a [adv] [adj] period for | 8 |
|
| 11 | a [adv] [adj -er] period [prep] | 8 |
|
| 12 | a much [adj] period [prep] | 7 |
|
| 13 | a [adv] brief period [prep] | 6 |
|
| 14 | a [adv] brief period [prep] | 6 |
|
| 15 | a particularly [adj] period [prep] | 5 |
|
| 16 | a [adv] lengthy period [prep] | 5 |
|
| 17 | a [adv] longer period [prep] | 5 |
|
| 18 | a fairly [adj] period [prep] | 5 |
|
| 19 | a [adv] lengthy period [prep] | 5 |
|
