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I usually get confused when I come across for past few days and from past few days

What is the difference between them?
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For the past few days is the normal and common phrase.
eg For the past few days,I have been sick'.

From the past few days would only be OK in special contexts,
eg Judging from the past few days, he is a good teacher.

Clive
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Ok thanks. So, we cannot use from the past few days as in the sentence below ?

From the past few days, my brother has been practicing to play piano. or My brother has been practicing to play piano from the past few days,
No, that doesn't sound right.

You should say "my brother has been practing to play the piano for the past few days".

"My brother has been practicing to play the piano from the past few days" is wrong because it sounds like you are saying he is practicing on the piano from the past few days, as the piano is new.
So if I assume the piano to be new then we need to use "from"?

How about the first sentence?
Students: We have free audio pronunciation exercises.
The first one is incorrect