In many ways, the most useful of all tools is the knife.

"I think you will find this the most useful of all."

The money was useful, of course, but it could not solve my difficulties.

The most useful of these is the Square 4.0 decoder.

She didn't know how useful or important any of this was.

It is the most useful of skills for a midwife.

With the mule being the most useful of the bunch.

Useful, of course, but they must know who the master is.

Ask them to do anything useful, of course, and you get bad temper all day long.

By 1976 this system was still considered useful in any conflict short of nuclear war.