| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been known for some [noun] | 20 |
|
| 2 | have been known for [det] time | 16 |
|
| 3 | have been known for [det] [noun sg] | 16 |
|
| 4 | have been known for [det] time | 16 |
|
| 5 | has been known for [det] [noun] | 16 |
|
| 6 | have been known for [det] years | 15 |
|
| 7 | have been known for [det] [noun pl] | 15 |
|
| 8 | have been known for [det] year | 15 |
|
| 9 | have been known for [det] [noun] | 10 |
|
| 10 | have been known for many [noun] | 10 |
|
