something & anything

Hello all, 

1. The police haven't confirmed if the man has _______ to do with the murder.
A. something
B. anything

2. She lost herself in doing homework so that she didn't hear ____ knocking at the door at all.
A. somebody
B. anybody

How I look at the two or such questions?
The two questions can boil down to one,
“How should one use “some-“ and “any-“ in a sentence correctly?”
In fact, the two are questions raised by several English beginners who are enthusiastic about English grammar. They insist that both A and B are correct in each question. It is the result of their research. I don’t think it is meaningful for a non-native who has just grasped a few grammar rules to do “research” on the language; instead, just following natives is sensible, --- safe and sound.

What are my answers to the two questions?
For question 1, the key must be B. I see no reason to justify the option A.
For question 2, I would pick B, though I feel A may be possible in some unusual cases.

What is my question?
Whatever the answer is, what would “some-” mean behind in both 1 & 2?

My try first:
1. something: We need to presume that there is a group of things that are against “the man”, and the police have found one at least, and they want to confirm it. --- It is absurd.
2. somebody: Like 1, we need to presume that there is a certain group of people who are to knock at the door, --- and it is also an unlikely scenario.

Many many thanks.

Last edited by Mengxin_2009
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