I've got a sentence:
The war seriously affected petrol prices.
My question is why not "petrol price"?
My reasoning is that the petrol price used here is a noun phrase.
My second question is about comparison of similar sentences:
-She has certainly made him angry.
She certainly has made him angry.
- I am really sorry.
I really am sorry.
-Polite people always say 'thank-you'.
I always do say 'thank-you'.
My third question is from a sentence as well:
I don't trust politicians. I never have, and I never will.
Here why is I never "have"? What about I never "do"?
Last question is a US diplomat and an MP.
Why is not an US diplomat? a MP?
It is not "an" U.S. diplomat because we don't use "an" simply because the next letter is a vowel. It is the sound of the word/letter which is important. When we say "U.S", it sounds like "You Ess". The sound "y" at the beginning of "you" is not a vowel sound so it is preceded by "a".