| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [adv] used [prep] | 37 |
|
| 2 | have been [adv] used in | 28 |
|
| 3 | have been widely used [prep] | 26 |
|
| 4 | have been [adv] used [prep] | 22 |
|
| 5 | have been [adv] used for | 10 |
|
| 6 | have been successfully used [prep] | 9 |
|
| 7 | have been [adv] used by | 9 |
|
| 8 | have been much used [prep] | 6 |
|
| 9 | have been extensively used [prep] | 6 |
|
| 10 | have been [adv] used on | 5 |
|
| 11 | have been [adv] used as | 5 |
|
