| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [verb] a [adj] period [prep] | 10 |
|
| 2 | [be] [verb] a [adj] period [prep] | 10 |
|
| 3 | be [verb] a [adj] period [prep] | 10 |
|
| 4 | [be] [verb] a [adj] period [prep] | 8 |
|
| 5 | [be] [verb] a [adj] period of | 7 |
|
| 6 | [be] [verb] a [adj] period of | 7 |
|
| 7 | [be] [vb pp] a [adj] period [prep] | 5 |
|
| 8 | [be] [v-ing] a [adj] period [prep] | 5 |
|
