Difference between 'if', 'as' and 'because'

[Guest]

Test No. incompl/elem-11 "Conditionals", question 2

......... I bought you a new car, would you be very happy?

(a) When
(b) If
(c) As

Test No. incompl/elem-11 "Conditionals", answer 2

If I bought you a new car, would you be very happy?

Correct answer: (b) If
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Which is the diference between when if and as

[Alan]

If introduces a conditional sentence as often means because.
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English as a Second Language
You can read my ESL story Everything in the Garden is lovely

[Mariz Ester]

Test No. incompl/elem-11 "Conditionals", answer 2

If I bought you a new car, would you be very happy?

I want to comment on this sentence because I think the correct sentence should be "If I will buy you a new car, would you be very happy?" The possibility of buying is still conditional. It can possibly happen in the future. Please correct me if I am wrong.

[Luzukonow]

Hey Mariz I think if I bought is perfectly right for this stuation to me if I will talks about something will happen in future.If I bought is past continuas.