英和和英

to be necessary

do the necessary

something that is indispensable

an indispensable implement

according to the need

position or line of employment

the matter which must be addressed

that should be done

the act of requiring

to be suitable for

of something, to be needed

require exertion

to suit the exigency

make according to requirements

to be pressed by necessity

It's necessary.

do the needful

a thing which must be done

to be enforced―come into force―go into effect―take effect―become operative

have need of

by necessity

to be sufficient

demand for a product or service

a necessary thing

to meet a need

the degree of indispensability

to cause necessity―necessitate

immediate needs

It is necessary.

to meet a need―meet a want