Your question is not very clear to me. Do you want to know how to use "which" and "if" in a sentence? 1. Which Which has many uses, mainly 2 important ones: In a question such as "Which shirt do you like? The red one or the green one?" it is used to ask for a CHOICE. It can also be used to start a phrase describing something. For example: "He ate the pizza which he found behind the fridge." 2. If If-sentences are easy. "If you want to learn how to make an if-sentence, just try to make one right now. :)" or "Try to make one right now if you want to learn how to make if-sentences." That's the most basic structure for if-sentences. Both ways are correct. I'm not sure that's what you wanted, hope it helped anyway.

Hello Smiler, IF: - A conjugation that means ' in case that or on condition that': " If you try hard, it might work." " If he is poor , would you marry him?" - used to introduce an indirect question. In this sense, if approaches the meaning of whether - used to introduce expressions of desire, with only : "If I had only known.." WHICH: - used with a noun in requesting that its referent be further specified, identified, or distinguished from the other members of a class : "Which house did you want to buy?" - whatever of a class; whichever : " Put on which dress you want" - used in relative clauses with inanimate antecedents : The house, which is so old... The car, which you bought last year... - as; and that: used in relative clauses with verb phrases or sentences as their antecedents : He decided not to buy the house, which I knew in advance.

hehe~~ thanks for your help... the right question is"how can you use for 'whether' & 'if'' "

hehe~~ thanks for your help... the right question is"how can you use for 'whether' & 'if'' "

hehe~~ thanks for your help... the right question is"how can you use for 'whether' & 'if'' "