| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] be [verb] for [art] period | 7 |
|
| 2 | [noun pl] [be] [verb] for a period | 5 |
|
| 3 | [noun pl] [be] [vb pp] for [art] period | 5 |
|
