| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a long [noun] | 116 |
|
| 2 | [v-ing] [prep] a long [noun sg] | 114 |
|
| 3 | [verb] [prep] a long period | 91 |
|
| 4 | [v-ing] [prep] a [adj] period | 42 |
|
| 5 | [v-ing] [prep] [art] long period | 5 |
|
| 6 | [v-ing] [prep] a long period | 5 |
|
| 7 | [v-ing] [prep] a long period | 5 |
|
