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Silence is most useful when broken.
The HELP strategy is most useful when you are making decisions.
There are many useful inventions of science. The answers vary. Some believe the number one invention that is the most useful in science is the electric furnace. It was made in 1889. The electric furnace converted aluminum to metal that was very useful. Another invention that people considered the most useful invention of science are antibiotics. Antibiotics help cure many illnesses.
Prediction.
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more useful, the most useful
Most useful and more useful.
Comparative: more useful Superlative: most useful
um... I'm pretty sure it's more helpful and the most helpful?
Silence is most useful when broken.
most useful
more useful, most useful
more useful and most useful
more useful, most useful
What the most useful machine is, is a matter of opinion. Some would argue that the wheel is the most useful machine, and others would argue that the lever is the most useful.
The most useful site in the internet is google.com.