| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be for [num] months | 13 |
|
| 2 | [be] for [num] months | 13 |
|
| 3 | [was/were] for [num] months | 5 |
|
| 4 | [be] for six months | 5 |
|
| 5 | was for [num] months | 5 |
|
