The correct forms: A) If she lates, we will go without her.
B) If she is late, we will go without her.
C) If she is lates, we will go without her.
D) If you asks more politely, I will buy you a drink.
E) If you ask more politely, I will buy you a drink.
F) If you asking more politely, I will buy you a drink.

Объясните, почему

B.If she is late we will go without her.

Придаточное предложение, if she is late стоит в present simple, главное предложение we will go without her

Должно стоять в будущем времени future simple.

E. If you ask more politely I will buy you a drink.

Придаточное предложение if you ask but more politely-present simple, главное предложение, I will buy you a drink-future simple.

Это условные предложения 1 типа.