| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [adv] [prep] a period | 30 |
|
| 2 | [be] [vb pp] [adv] [prep] a period | 26 |
|
| 3 | [be] [verb] [adv prt] [prep] a period | 19 |
|
| 4 | [be] [verb] [adv] over a period | 13 |
|
| 5 | [be] [verb] [adv] [prep] a period | 10 |
|
| 6 | [be] [verb] [adv] [prep] a period | 9 |
|
| 7 | be [verb] [adv] [prep] a period | 9 |
|
| 8 | [be] [verb] [adv] for a period | 9 |
|
| 9 | [be] [verb] up [prep] a period | 8 |
|
| 10 | [be] [verb] up [prep] a period | 8 |
|
| 11 | [am/are] [verb] [adv] [prep] a period | 6 |
|
| 12 | [be] build [adv] [prep] a period | 6 |
|
| 13 | [was/were] [verb] [adv] [prep] a period | 6 |
|
| 14 | [be] built [adv] [prep] a period | 6 |
|
| 15 | are [verb] [adv] [prep] a period | 5 |
|
| 16 | [is] [verb] [adv] [prep] a period | 5 |
|
| 17 | is [verb] [adv] [prep] a period | 5 |
|
