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Why sometimes you are very busy and sometimes you are very free?

Why sometimes are you very busy and sometimes are you very free?

God makes mistakes some time.

God makes mistakes sometime/sometimes.

We do stay some time there and return back to home.

I visit this forum sometimes/sometime.

I stay in this forum for some time/sometime.

Please correct my sentences.
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Why are you sometimes very busy and sometimes very free?

God makes mistakes sometimes.

We stay there for some time and return back to home.

I visit this forum sometimes.

I stay in this forum for some time.
Comments  
Students: We have free audio pronunciation exercises.
Thank you Mister Micabwer.

Again, my try :

I have visited him sometime.
I visit him sometimes.

I visited him sometimes/sometime.

Please correct these sentences.
I have visited him sometime. (but I forget when)
I visit him sometimes. (from time to time; occasionally)
I visited him sometimes/sometime.

All OK, but as you know, with different meanings. Sometime = at an unspecified time. Sometimes = occasionally. (And Some time = a considerable length of time. And Some times = several times.)