It is necessary.
It's necessary.
to meet the need―fill a need―minister to one's needs
according to the need
to urge (on one) the necessity of something―impress upon one the importance of something
必要次第に
according to the need―according to the urgency of the case
必要としないこと
Both are necessary.
必要のない
without any necessity
修正が必要
It take many men―requires a number of hands.
I will work if necessary―if need be.
検討が必要
to excessively praise someone or something