| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to learn about [noun sg] | 15 |
|
| 2 | [vb base] to learn about [noun sg] | 6 |
|
| 3 | have to learn about [noun sg] | 5 |
|
| 4 | [vb past] to learn about [noun sg] | 5 |
|
| 5 | begin to learn about [noun sg] | 5 |
|
