No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a period of [noun pl] | 123 | |
2 | over a period [prep] [noun pl] | 110 | |
3 | [prep] a period [prep] years | 70 | |
4 | [prep] a period [prep] months | 20 | |
5 | [prep] a period [prep] weeks | 19 | |
6 | for a period [prep] [noun pl] | 9 | |
7 | [prep] a period [prep] days | 5 |