3 a) Read the examples and the rules. 1 To make this dish you need some tomatoes, an egg and some olive oil.

This sentence uses 'some' with plural countable nouns (tomatoes) and singular uncountable nouns (olive oil), and 'an' (a form of 'a/an') with a singular countable noun (egg). This aligns with the rule that 'some' is used in affirmative sentences with both countable and uncountable nouns.