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The noun "strength" can be both countable and uncountable.

strength → uncountable

Meaning: physical power, or how strong someone or something is

Example sentence: The refrigerator was really heavy, and lifting it took all our strength.

strength → countable

Meaning: an important ability or feature

Example sentence: Julia's greatest strength is her ability to see and overcome her own weaknesses.

Quick Quiz:

In which sentence is the word "strength" uncountable?

a. One of the team's best qualities is the strength of its defence.

b. One of the team's strengths is the high quality of its defence.

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Contributor: Matt Errey