In Paragraphs^x, Direct questions^x

I went to Circuit City, one of the electronic shops in the area, for a new portable PSP product from SONY which *have (agreement) just *been released. I *was a mystery shopper who *wants (tense) to buy one of *this hottest PSP, which *could play movieS, music, and video games in one single...

I need you helping me over this, my grammar is my main problems. Thanks in advance I went to Circuit City, one of the electronic shops in the area, for a new portable PSP product from SONY which have just released this several months. I pretended to be a customer who wants to buy one of this...

Never use "will" in the clause where you use "while/when/before/after/by the time/as soon as/if/unless". 1. "Never" is a strong word! 2. Since 'if' and 'unless' do not introduce time clauses, we can't conclude that only time clauses are included in the "rule" - only that the "rule" applies...