No | Pattern | Freq | Relations |
---|---|---|---|
1 | a long period [modal v] [verb] | 6 | |
2 | a long period [vb mod] [verb] | 6 | |
3 | [prep] a long period [verb] | 11 | |
4 | [prep] a long period [verb] | 11 | |
5 | for a long period [verb] | 6 | |
6 | for a long period [verb] | 6 | |
7 | over a long period [verb] | 5 | |
8 | over a long period [verb] | 5 |