| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adv] [adj] period of time | 51 |
|
| 2 | a [adv] long period of [noun] | 15 |
|
| 3 | a [adv] long period of [noun sg] | 15 |
|
| 4 | a [adv] long period of time | 13 |
|
| 5 | a [adv] long period of time | 13 |
|
| 6 | a [adv] long period [prep] time | 13 |
|
| 7 | [art] [adv] long period of time | 13 |
|
| 8 | [art] [adv] long period of time | 13 |
|
| 9 | a [adv] long period of time | 13 |
|
| 10 | a [adv] long [noun] of time | 13 |
|
| 11 | a [adv] long period of time | 13 |
|
| 12 | a [adv] long [noun sg] of time | 13 |
|
| 13 | a [adv] long period of time | 13 |
|
| 14 | a [adv] long period [prep] time | 13 |
|
