| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been used [prep] [det] years | 14 |
|
| 2 | [been] used [prep] [det] years | 14 |
|
| 3 | [been] used for [det] years | 13 |
|
| 4 | [been] used for [det] years | 13 |
|
| 5 | [been] used [prep] many years | 12 |
|
