| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] have [been] used for years | 5 |
|
| 2 | have [been] used for [det] years | 12 |
|
| 3 | have [been] used for [adj] years | 12 |
|
| 4 | have [been] used for many years | 11 |
|
| 5 | have [been] used for many years | 11 |
|
