| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used for [noun pl] | 12 |
|
| 2 | have been [vb pp] for years | 10 |
|
| 3 | have been made for [noun pl] | 8 |
|
| 4 | have been [vb pp] for centuries | 8 |
|
