| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] need for | 9 |
|
| 2 | have [been] need for | 9 |
|
| 3 | have [been] need for | 6 |
|
| 4 | [vb infin] [been] need for | 6 |
|
