| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a week [unc] | 124 |
|
| 2 | [prep] a week ['s] | 122 |
|
| 3 | [prep] a week [unc] | 121 |
|
| 4 | [prep] a week 's | 119 |
|
| 5 | [prep] a week 's | 119 |
|
| 6 | for a week [unc] | 38 |
|
| 7 | for a week [unc] | 38 |
|
| 8 | in a week [unc] | 28 |
|
| 9 | in a week [unc] | 28 |
|
| 10 | of a week [unc] | 14 |
|
| 11 | of a week [unc] | 14 |
|
| 12 | after a week [unc] | 13 |
|
| 13 | after a week [unc] | 13 |
|
| 14 | on a week [unc] | 10 |
|
| 15 | on a week [unc] | 10 |
|
