It was hotter yesterday

it was hotter yesterday为什么yesterday前面不加than it is hotter today than it was yesterday 今天比昨天热有几种说法呀?it is hotter today than it was yesterday.today It is hot today.It was hotter yesterday.(合并成一句话） It was very hot yesterday,but it is__today A.even hotter B.m It is hot today .It was much hotter yesterday.（合为一句） It was very hot yesterday,but it is__ tody.A.even hotter B.m It is (hot/hotter)today thsn yesterday.是hot还是hotter? ?was it yesterday? It was Sunday yesterday was it (snow) yesterday? ---------------- yesterday?It was hot