why we don't put the article in the sentence soap is necessary for washing
Soap, like food, luggage, water, salt, rice and many other indivisible substances, is non-count. " Articles for general mention of non-count words are not used.
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Soap, like food, luggage, water, salt, rice and many other indivisible substances, is non-count.
We cannot write "one soap." Articles for general mention of non-count words are not used.
Lena,
Your use of hyphens ( - ) has caused the strike-outs. (soap)
CJ