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Trees are usually green–no article is needed, because you are talking generally and the noun is not definite, i.e. you are not talking about specific trees.
The trees in the park are green–the article is needed because you have specified which trees you are talking about.
What is the definition of specified item? When an item is not generic one, it is a specified item? I list up some examples, and would you check them?
Generic, when they are used in a generic statement
Trees/a tree
Money doesn't grow on trees, but it seemed to fall from the sky in Indianapolis.
Specific?
Trees in Japan
Trees of any size*
Trees across the city**
*Trees of any size are accepted for $1 at the 250 Birch Bay-Lynden Road facility.
**Fliers with his photo were posted on businesses poles and trees across the city.
My apologies if this question needs long explanations.
Supercat What is the definition of specified item? You can point to it or them. g.
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SupercatWhat is the definition of specified item?
You can point to it or them.
e.g.
The trees in the park - Go to that park and point to the trees. Take a picture of them.
SupercatTrees in Japan
It can be either specific or generic.
1. The trees in Japan have shorter average lifetimes than those
SupercatI listupsome examples,
The second word should be listed. The third word is superfluous.