Answer:
a) If you wash boss's car then you will get promoted.
b) If there are winds from the south then there will be the spring thaw.
Explanation:
To convert a general statement in if then.Just analyse the sentence carefully find the cause and the effect in the statement and place the cause in the if and the effect in then.
Here are the converted statements.
If you wash boss's car then you will get promoted.
cause = washing and effect =promotion
If there are winds from the south then there will be the spring thaw.
cause = winds from south and effect spring thaw.