| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | several years [unc] [noun sg] | 23 |
|
| 2 | several years ' [noun sg] | 23 |
|
| 3 | several years ['s] [noun sg] | 23 |
|
| 4 | several years ' [noun sg] | 23 |
|
| 5 | several years [unc] experience | 7 |
|
