| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adv] a year | 278 |
|
| 2 | [adv] [adv] a year | 278 |
|
| 3 | [adv] [noun] a year | 250 |
|
| 4 | [adv] [n mass] a year | 248 |
|
| 5 | [adv] over a year | 131 |
|
| 6 | [adv] over a year | 131 |
|
| 7 | [adv] [prep] a year | 113 |
|
| 8 | [adv] [prep] a year | 113 |
|
| 9 | [adv] [conj] a year | 110 |
|
| 10 | [adv] [subord] a year | 108 |
|
| 11 | [adv] than a year | 106 |
|
| 12 | [adv] than a year | 106 |
|
| 13 | [adv] once a year | 69 |
|
| 14 | [adv] once a year | 69 |
|
| 15 | [adv] [verb] a year | 62 |
|
| 16 | [adv] [adj] a year | 50 |
|
| 17 | [adv] for a year | 46 |
|
| 18 | [adv] for a year | 46 |
|
| 19 | [adv] [num] a year | 26 |
|
| 20 | [adv] twice a year | 23 |
|
| 21 | [adv] twice a year | 23 |
|
| 22 | [adv] [vb pp] a year | 22 |
|
| 23 | [adv] in a year | 22 |
|
| 24 | [adv] in a year | 22 |
|
| 25 | [adv] about a year | 19 |
|
| 26 | [adv] about a year | 19 |
|
| 27 | [adv] [det] a year | 14 |
|
| 28 | [adv] half a year | 12 |
|
| 29 | [adv] half a year | 12 |
|
| 30 | [adv] [vb past] a year | 12 |
|
