| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | about [adj] months | 511 |
|
| 2 | about [num] months | 511 |
|
| 3 | about four [noun] | 414 |
|
| 4 | about four [noun pl] | 381 |
|
| 5 | [adv] four months | 141 |
|
| 6 | about four month | 47 |
|
| 7 | about four months | 47 |
|
