| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | years has been | 195 |
|
| 2 | areas has been | 27 |
|
| 3 | countries has been | 26 |
|
| 4 | children has been | 23 |
|
| 5 | systems has been | 21 |
|
| 6 | services has been | 19 |
|
| 7 | studies has been | 17 |
|
| 8 | products has been | 17 |
|
| 9 | months has been | 17 |
|
| 10 | families has been | 15 |
|
| 11 | groups has been | 15 |
|
| 12 | pounds has been | 14 |
|
| 13 | women has been | 14 |
|
| 14 | decades has been | 14 |
|
| 15 | schools has been | 13 |
|
| 16 | workers has been | 12 |
|
| 17 | cells has been | 12 |
|
| 18 | authorities has been | 12 |
|
| 19 | programmes has been | 11 |
|
| 20 | students has been | 11 |
|
| 21 | developments has been | 11 |
|
| 22 | weeks has been | 11 |
|
| 23 | changes has been | 11 |
|
| 24 | materials has been | 10 |
|
| 25 | relations has been | 10 |
|
| 26 | industries has been | 10 |
|
| 27 | projects has been | 10 |
|
| 28 | events has been | 10 |
|
| 29 | governments has been | 9 |
|
| 30 | companies has been | 9 |
|
