Interrogative adverbs are used in questions. How much is used with uncountable nouns, whilst How many is used with countable nouns.
Interrogative adverbs | Rule | Examples |
Why? (Perchè?) | It is used only in questions. |
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When? (Quando?) | It is used in questions to know the time or the period in which a certain action or event has taken place or will take place |
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Where? (Dove?) | It is used in questions to know the place where a certain action or event has taken place or will take place |
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How? (Come?) | It is used when the speaker wants to know the way in which something has happened or will happen. |
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How much? (Quanto?) | It is used only with singular uncountable nouns |
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How many? (Quanti/e?) | It is used with plural countable nouns |
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Interrogative adverbs