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I can't discriminate between ''in the beginning'' and ''at the beginning''
Please help me to differentiate and explain why.
Thanks very much!
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They essentially mean the same thing, but "In the beginning" has a more important tone. It's also used to reference the Bible.
Comments  
Students: We have free audio pronunciation exercises.
can you give me some specific examples?
at the beginning = when something begins (specific point in time)
EX: I couldn’t follow the film because I wasn’t there at the beginning.
The opposite: At the end
In the Beginning = At first, to begin with
ex: In the beginning I found it hard to concentrate, but now it's much easier.
The opposite: In the end