| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun sg] of years | 685 |
|
| 2 | for a [noun sg] of years | 389 |
|
| 3 | [prep] a number of years | 369 |
|
| 4 | [prep] a couple of years | 215 |
|
| 5 | over a [noun sg] of years | 160 |
|
| 6 | [prep] a period of years | 70 |
|
| 7 | in a [noun sg] of years | 49 |
|
| 8 | after a [noun sg] of years | 26 |
|
| 9 | within a [noun sg] of years | 17 |
|
| 10 | [prep] a term of years | 17 |
|
| 11 | of a [noun sg] of years | 12 |
|
| 12 | about a [noun sg] of years | 8 |
|
| 13 | by a [noun sg] of years | 5 |
|
