| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] a period | 88 |
|
| 2 | [v-ing] a period | 75 |
|
| 3 | [vb -s] a period | 63 |
|
| 4 | [vb pp] a period | 50 |
|
| 5 | have a period | 48 |
|
| 6 | [vb base] a period | 45 |
|
| 7 | [to-vb] a period | 44 |
|
| 8 | [vb infin] a period | 43 |
|
| 9 | follow a period | 42 |
|
| 10 | enter a period | 29 |
|
| 11 | following a period | 23 |
|
| 12 | spend a period | 18 |
|
| 13 | cover a period | 17 |
|
| 14 | has a period | 15 |
|
| 15 | followed a period | 13 |
|
| 16 | face a period | 12 |
|
| 17 | undergo a period | 11 |
|
| 18 | entering a period | 10 |
|
| 19 | span a period | 10 |
|
| 20 | entered a period | 9 |
|
| 21 | need a period | 9 |
|
| 22 | require a period | 8 |
|
| 23 | entered a period | 8 |
|
| 24 | had a period | 8 |
|
| 25 | had a period | 7 |
|
| 26 | include a period | 7 |
|
| 27 | mean a period | 7 |
|
| 28 | undertake a period | 6 |
|
| 29 | experience a period | 6 |
|
| 30 | means a period | 6 |
|
