i don't know when i should post on

i don't know when i should post on FB some friend isn't .
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ผลลัพธ์ (อังกฤษ) 1:

I don't know when i should post on FB isn't some friend.
I'm not sure.

ผลลัพธ์ (อังกฤษ) 2:

i do not know when i should post on FB some friend is not.
'm not sure

ผลลัพธ์ (อังกฤษ) 3:

I don 't know when I should post on FB some friend isn' t.
I'm not sure.