| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was [verb] [prep] [adj] months | 177 |
|
| 2 | was [verb] [prep] [num] months | 170 |
|
| 3 | was [verb] [prep] 15 [noun] | 65 |
|
| 4 | was [verb] [prep] 15 [noun pl] | 38 |
|
| 5 | be [verb] [prep] 15 months | 15 |
|
| 6 | [be] [verb] [prep] 15 months | 15 |
|
| 7 | [was/were] [verb] [prep] 15 months | 9 |
|
| 8 | was [verb] [prep] 15 months | 8 |
|
| 9 | was [verb] [prep] 15 months | 8 |
|
| 10 | was [verb] [prep] 15 month | 8 |
|
