Disliked1 st) You understood right.But not only the last wave is impulsive or not also you have to pay attention to fibo ratios. b wave has to touch min %50 of a , wave c cant be bigger than fib exp 1.618% of wave a-b. All situations have to mach it is very important..Ignored
Disliked2nd) Because subwave a of wave w has w-x-y combination structure . For to be wave 2, as wave b has to touch min fib %50 of wave 1.