for ALL of this thread (Part 1, and this, Part 2)
3. Do that... and you'll regret it.
b)Do that..if (you think) it'll help + (correct)
c) Do that..if you'll get the opportunity + (correct)......if you get the opportunity
d)Do that (and) - we'll lose business + (correct)
4. I'd stay and help you...
a) if I knew anything about computers. + (correct)
b) if I'm going out this evening - (incorrect)INCORRECT - If I don't go out this evening...if I wasn't going out this evening
c) if I hadn't promised Jo I'd meet her. + (correct)
d) if you asked me nicely + (correct)
5. I'd be grateful...
a) if you could sort this out for me - (incorrect) CORRECT
b) if you'd keep this to yourself + (correct)
c) if you don't tell anyone about this + (correct)...I think you typed the correct answer next to (a) when you meant it for here: ...if you didn't tell anyone about this
d) if you remembered that in future. - (correct)