| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun sg] of years [verb] | 47 |
|
| 2 | a number of years [verb] | 21 |
|
| 3 | a couple of years [verb] | 17 |
|
| 4 | a [noun sg] of years [to-vb] | 15 |
|
| 5 | a [noun sg] of years [v-ing] | 13 |
|
| 6 | a [noun sg] of years have | 9 |
|
| 7 | a [noun sg] of years [vb -s] | 8 |
|
| 8 | a [noun sg] of years has | 6 |
|
| 9 | a [noun sg] of years [vb base] | 5 |
|
