| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a period [v-ing] [prep] | 6 |
|
| 2 | [prep] a period [v-ing] [prep] | 5 |
|
| 3 | mean a period [v-ing] [prep] | 5 |
|
| 4 | means a period [v-ing] [prep] | 5 |
|
| 5 | [prep] a period [v-ing] [prep] | 5 |
|
| 6 | [vb -s] a period [v-ing] [prep] | 5 |
|
| 7 | a [adj] period [v-ing] [prep] | 14 |
|
| 8 | a [adj] period [v-ing] [prep] | 13 |
|
| 9 | a period [prep] [v-ing] [prep] | 8 |
|
| 10 | a period of [v-ing] [prep] | 8 |
|
| 11 | a period [prep] [v-ing] [prep] | 8 |
|
| 12 | a period of [v-ing] [prep] | 8 |
|
| 13 | a period [v-ing] [prep] [art] | 7 |
|
| 14 | a period [v-ing] [prep] [art] | 7 |
|
| 15 | a period [v-ing] [prep] the | 6 |
|
| 16 | a period [v-ing] [prep] the | 6 |
|
