Hi guys,
The British arm of the fast-food giant McDonald's said it would be ...
Why dont we say giant fast-food?!please explain!?
Let me try to explain in another way.
Let's add two commas to show the structure of the sentence more clearly.
The British arm of the fast-food giant, McDonald's, said it would be ...
'Giant' and 'McDonald's are both nouns, in apposition. 'Fast-food' here is an adjective that describes the noun 'giant'.
If you say The British arm of the fast-food giant McDonald's said it would be ..., you are using 'fast-food' and 'giant' as adjectives that describe the proper noun 'McDonald's.' That's correct grammar, but it really doesn't make much sense to talk about 'the fast-food McDonald's' or 'the giant McDonald's'.
Best wishes, Clive