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このリンゴは何個ありますか?
How many apples are there?
A question word used to ask about the quantity of countable objects.
この本は何個買いましたか?
How many books did you buy?
何個のリンゴを食べましたか?
How many apples did you eat?
Used for countable nouns. For uncountable nouns, use "何" alone.
Use "何個" only with countable nouns. For uncountable nouns, use "何" alone.
Choose the appropriate counter based on the object's shape and size, not just "何個". For example, use "何本" for pencils.
Combination of "何" (what) and "個" (counter for small objects).
For larger objects, use "何本" (for long objects), "何枚" (for flat objects), etc. instead of "何個".