PASO 1Elige la opción correcta
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When we mean only one thing we say an item or a bit of information: He gave me a useful item of information.
Machinery is a singular noun and always takes a singular verb and pronoun. We can say a piece of machinery or pieces of machinery
When we mean only one thing we say a piece of advice: Let me give you a piece of advice.
When we use hair to denote a single thread, the plural form is hairs: I found two long hairs in my food.