To: aviv
Hello Aviv,
1. How to identify a habit, a scientific fact or general truth?
You don't have to know true information for the sentence correction problems. Only grammar! You just have to match two clauses: real with real, unreal with unreal.
2. In conditional questions when should one use the Inversion??
You can use inversion instead of the not inverted form for real future, unreal future and unreal past conditions, but always check if there are any other differences among the answer choices, probably really important difference is not in conditionals.
3. In any sentence appearance of if calls for check for conditionals???
There is also another type of questions they like on GMAT: to choose between 'if' and 'whether' (in this case the sentence won't be conditional at all), and you will always choose the answer choice with 'whether'.
Good luck!
Irene
