| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv prt] a [adj] period of time | 16 |
|
| 2 | [adv] a long period of time | 11 |
|
| 3 | [adv prt] a long period of time | 8 |
|
| 4 | [adv prt] a long period of time | 8 |
|
| 5 | [adv prt] [art] long period of time | 8 |
|
| 6 | [adv prt] a long [noun] of time | 8 |
|
| 7 | [adv prt] a long [noun sg] of time | 8 |
|
| 8 | [adv prt] a long period of time | 8 |
|
| 9 | [adv prt] a long period [prep] time | 8 |
|
| 10 | [adv prt] a long period [prep] time | 8 |
|
| 11 | [adv prt] a long period of [noun] | 8 |
|
| 12 | [adv prt] [art] long period of time | 8 |
|
