the perfect continuous

Hello
I'd like to ask about the perfect tense.
If you want to talk about the action which began in the past and is still continuing,
you will use the present perfect continuous. However, sometimes the present perfect simple seems to be used for the same situation.

Would you take a look at the following sentences?
1) It has been raining hard since last night.
2) It has rained hard since last night.
Instead of 1) do you use 2)?

Here is another sentence.
3) Mary was angry because she had waited for Jim for 2 hours.
Does 3) make sense? Or should I express like 4)?

4) Mary was angry because she had been waiting for Jim for 2 hours.

Could I have some comment?
Thank you.
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