| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [adv] [prep] a [adj] period | 40 |
|
| 2 | [vb pp] [adv] [prep] a continuous [noun] | 9 |
|
| 3 | [vb pp] [adv] [prep] a continuous [noun sg] | 9 |
|
| 4 | [vb pp] [adv] [prep] [art] continuous period | 5 |
|
| 5 | [vb pp] [adv] [prep] a continuous period | 5 |
|
| 6 | [vb pp] [adv] [prep] [art] continuous period | 5 |
|
| 7 | [vb pp] [adv] [prep] a continuous period | 5 |
|
| 8 | [verb] [adv] [prep] a continuous period | 5 |
|
