C to MIPS32 assembly

I'm having some trouble figuring out how to express the following C segment, specifically the compound if statement, in MIPS32 assembly:
if((text[i] >= 65 && text[i] <= 90) || (text[i] >= 97 && text[i] <= 122))
{
    text[j] = text[i];
    charCount++;
}
else
{
    badword = true;
    last = last - charCount;
}

Can anybody give me some help with this?

oops I mean mov ax, [si+text]