Answer:
a) If people eat too much, they will get fat.
b) If you send this letter now, she will receive it tomorrow.
c) Snakes will bite, if they are scared.
d) If John has the money, he can/will buy the car. (either can or will would work)
e) If I can find her address, I will send her an invitation.
f) If I take this test, I can improve my English.
g) Babies will cry, if they are hungry.
Explanation:
There are two parts of conditionals. There is the If part and the what happens part. They're separated by a comma and they can be in any order.
Example: If this happens, something else will happen because of it.
I hope this helps!
