| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [adv] for [num] [noun pl] | 14 |
|
| 2 | has been [adv] for [num] [noun] | 10 |
|
| 3 | has been [adv] for [num] years | 10 |
|
| 4 | has been [adv] for [num] year | 10 |
|
