| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] through a period of | 41 |
|
| 2 | go through a period of | 32 |
|
| 3 | [v-ing] through a period of | 11 |
|
| 4 | [vb pp] through a period of | 8 |
|
| 5 | [vb past] through a period of | 7 |
|
| 6 | going through a period of | 6 |
|
| 7 | to go through a period of | 6 |
|
| 8 | [to-vb] through a period of | 6 |
|
| 9 | pass through a period of | 6 |
|
| 10 | went through a period of | 6 |
|
| 11 | gone through a period of | 5 |
|
| 12 | through a [adj] period of | 9 |
|
| 13 | through a [adj] period of | 9 |
|
| 14 | through a period of [adj] | 18 |
|
| 15 | through a period of [adj] | 17 |
|
| 16 | through a period of [noun sg] | 12 |
|
| 17 | through a period of [noun] | 12 |
|
| 18 | through a period of [verb] | 6 |
|
| 19 | through a period of [v-ing] | 6 |
|
