| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period of time | 283 |
|
| 2 | [prep] a long period of [noun] | 127 |
|
| 3 | [prep] a long period of [noun sg] | 123 |
|
| 4 | [prep] [art] long period of time | 103 |
|
| 5 | [prep] [art] long period of time | 103 |
|
| 6 | [prep] a long [noun] of time | 100 |
|
| 7 | [prep] a long period of time | 98 |
|
| 8 | [prep] a long period of time | 98 |
|
| 9 | [prep] a long period of time | 98 |
|
| 10 | [prep] a long period [prep] time | 98 |
|
| 11 | [prep] a long period [prep] time | 98 |
|
