| Share | Phrase |
|---|
| 18.70% | it [is] necessary |
| 11.98% | longer necessary |
| 8.65% | only [degree] necessary |
| 8.53% | extent necessary |
| 4.27% | force necessary |
| 3.65% | become necessary [perform operation] |
| 3.60% | time necessary |
| 3.49% | necessary [manner] repeat |
| 2.44% | divert ADVP necessary |
| 2.44% | shape like necessary |
| 2.42% | convert ADVP necessary |
| 2.33% | not necessary |
| 2.22% | necessary [does] overcome |
| 1.86% | necessary [does] substitute |
| 1.71% | amount necessary |
| 1.45% | carry out ADVP necessary |
| 1.42% | allow ADVP necessary |
| 1.38% | voltage necessary |
| 1.25% | reduce necessary [perform operation] |
| 1.14% | necessary [does] achieve |
| 1.12% | necessary [does] determine |
| 1.10% | necessary [connection] describe |
| 0.98% | necessary [does] vary |
| 0.94% | necessary [does] open |
| 0.88% | necessary [does] change |
| 0.87% | necessary [does] provide |
| 0.86% | greater than necessary |
| 0.78% | necessary [does] close |
| 0.76% | necessary [does] ensure |
| 0.69% | necessary [does] allow |
| 0.68% | necessary [does] remove |
| 0.61% | necessary [does] maintain |
| 0.61% | necessary [does] increase |
| 0.52% | provide necessary [perform operation] |
| 0.50% | necessary [does] use |
| 0.49% | high [size] necessary |
| 0.48% | power necessary |
| 0.43% | necessary [does] produce |
| 0.43% | necessary [does] operate |
| 0.40% | more [degree] necessary |
| 0.37% | increase necessary [perform operation] |
| 0.33% | determine necessary [perform operation] |