I´d like to ask about grammar in this sentence. I understand it means that a test it´s hard but why this form?
I found it in a book.
***** NOT A TEACHER *****
In rather formal English we can use too + adjective + a/an + noun:
• I hope you haven't had too tiring a day. (not ... a too tiring day.)
(In a less formal style we might say 'I hope your day hasn't been too tiring.')
(Advanced Grammar in Use - Martin Hewings)
**** NOT A TEACHER *****
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This is too big a subject
I think that you will find that thread very helpful.
Excuse me for not linking. I am computer illiterate. I still even use a dial-up computer!