| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period [prep] [prep] | 16 |
|
| 2 | over a period of [prep] | 16 |
|
| 3 | over a period of [prep] | 16 |
|
| 4 | over a period [prep] [prep] | 16 |
|
| 5 | [noun] over a period [prep] | 295 |
|
| 6 | [noun sg] over a period [prep] | 168 |
|
| 7 | [noun pl] over a period [prep] | 105 |
|
| 8 | [verb] over a period [prep] | 76 |
|
| 9 | [vb pp] over a period [prep] | 71 |
|
| 10 | [adv] over a period [prep] | 60 |
|
| 11 | [adv] over a period [prep] | 34 |
|
| 12 | [adj] over a period [prep] | 28 |
|
| 13 | [conj] over a period [prep] | 25 |
|
| 14 | [adv prt] over a period [prep] | 25 |
|
| 15 | [adj] over a period [prep] | 19 |
|
| 16 | [coord] over a period [prep] | 18 |
|
| 17 | [noun prp] over a period [prep] | 12 |
|
| 18 | and over a period [prep] | 12 |
|
| 19 | and over a period [prep] | 12 |
|
| 20 | place over a period [prep] | 9 |
|
| 21 | [n mass] over a period [prep] | 9 |
|
| 22 | up over a period [prep] | 8 |
|
| 23 | place over a period [prep] | 8 |
|
| 24 | up over a period [prep] | 8 |
|
| 25 | [pron] over a period [prep] | 7 |
|
| 26 | gradually over a period [prep] | 7 |
|
| 27 | gradually over a period [prep] | 7 |
|
| 28 | that over a period [prep] | 6 |
|
| 29 | that over a period [prep] | 6 |
|
| 30 | [that] over a period [prep] | 6 |
|
