| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a period [prep] | 346 |
|
| 2 | [verb] a period of | 298 |
|
| 3 | [vb past] a period [prep] | 80 |
|
| 4 | [v-ing] a period [prep] | 61 |
|
| 5 | [vb -s] a period [prep] | 52 |
|
| 6 | [vb pp] a period [prep] | 42 |
|
| 7 | [vb base] a period [prep] | 42 |
|
| 8 | follow a period [prep] | 39 |
|
| 9 | [vb infin] a period [prep] | 36 |
|
| 10 | have a period [prep] | 36 |
|
| 11 | [to-vb] a period [prep] | 34 |
|
| 12 | enter a period [prep] | 27 |
|
| 13 | following a period [prep] | 21 |
|
| 14 | [verb] a period in | 20 |
|
| 15 | cover a period [prep] | 15 |
|
| 16 | has a period [prep] | 13 |
|
| 17 | spend a period [prep] | 13 |
|
| 18 | followed a period [prep] | 12 |
|
| 19 | face a period [prep] | 12 |
|
| 20 | undergo a period [prep] | 10 |
|
| 21 | need a period [prep] | 9 |
|
| 22 | span a period [prep] | 9 |
|
| 23 | entered a period [prep] | 9 |
|
| 24 | [verb] a period for | 9 |
|
| 25 | require a period [prep] | 8 |
|
| 26 | entered a period [prep] | 8 |
|
| 27 | entering a period [prep] | 8 |
|
| 28 | had a period [prep] | 6 |
|
| 29 | experience a period [prep] | 6 |
|
| 30 | undertake a period [prep] | 6 |
|
