| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be used for years | 9 |
|
| 2 | [be] used for years | 9 |
|
| 3 | been used for years | 8 |
|
| 4 | [been] used for years | 8 |
|
| 5 | used for [adj] years | 27 |
|
| 6 | used for [det] years | 21 |
|
| 7 | used for many years | 18 |
|
| 8 | used for many years | 18 |
|
| 9 | used for [num] years | 6 |
|
| 10 | used for years [prep] | 6 |
|
| 11 | used for years [prep] | 6 |
|
