Just need help on number (6).

Exercise 1.2.6. Let E = The house is blue, let F = The house is 30 years old and G=The house is ugly. Translate the following statements into symbols. (1) If the house is 30 years old, then it is ugly. (2) If the house is blue, then it is ugly or it is 30 years old. (3) If the house is blue then it is ugly, or it is 30 years old. (4) The house is not ugly if and only if it is 30 years old. (5) The house is 30 years old if it is blue, and it is not ugly if it is 30 years old. (6) For the house to be ugly, it is necessary and sufficient that it be ugly and 30 years old