| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be [vb pp] for [num] year | 23 |
|
| 2 | [modal v] be [vb pp] for [num] year | 23 |
|
| 3 | [modal v] be [vb pp] for [num] years | 22 |
|
| 4 | should be [vb pp] for [num] year | 6 |
|
| 5 | should be [vb pp] for [num] year | 6 |
|
| 6 | must be [vb pp] for [num] year | 5 |
|
| 7 | must be [vb pp] for [num] year | 5 |
|
| 8 | [modal v] be [vb pp] for five year | 5 |
|
