使用符号R表示句子“It is raining”，符号S表示句子“It is sunny”，请用命题逻辑写下列的英语句子。
a.It is not raining.
b.It is not sunny.
c.It is neither raining nor sunny.
d.It is raining and sunny.
e.If it is sunny,then it is not raining.
f.If it is raining,then it is not sunny.
g.It is sunny if and only if it is not raining.
h.It is not true that if it is not raining,it is sunny.
