There's a problem I don't understand why I can't use absolutely should according to the book (Oxford Grammar Intermediate by Swan). Anyway, here's the problem:
Put in the best word: must or should
You absolutely (must/should) check the tyres before you take the car out today.
The key answer is must.
What I've known, must is stronger than should. The problem is, if we put an adjective behind either of them which makes it stronger, do they still have a difference?
By the way, I've checked the usage of both of these phrases here. For the convenient reason, here's the screenshot of the diagram:
As you can see there, absolutely should is more common than absolutely must. Does that mean, the book is incorrect? I mean, the answer should be both are correct. No?