| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] for about 20 | 16 |
|
| 2 | [noun] for about 20 | 11 |
|
| 3 | [noun sg] for about 20 | 8 |
|
| 4 | [vb base] for about 20 | 6 |
|
| 5 | for about 20 [noun] | 33 |
|
| 6 | for about 20 [noun pl] | 31 |
|
| 7 | for about 20 minutes | 18 |
|
| 8 | for about 20 minute | 18 |
|
| 9 | for about 20 years | 10 |
|
| 10 | for about 20 year | 10 |
|
| 11 | for about 20 per | 8 |
|
| 12 | for about 20 [no cls] | 8 |
|
| 13 | for about 20 per | 8 |
|
| 14 | for about 20 [unc] | 8 |
|
