It isn't raining. 一般现在时的肯定句改为否定句，第一步：看句子里是否有be动词或者情态动词，如果有，直接在be动词或情态动词后面加not第二步，如果没有，动词是实义动词，那么要借助动词don't或doesn't来构成否定句。
否定be动词即可。It isn't raining. 或 It's not raining.现在/这会儿没下雨。请采纳
否定句It isn't raining.
