改病句：Bob had to stay at home because the heavy snow.
问题描述：
改病句：Bob had to stay at home because the heavy snow.
答
because ---because of为什么？这是一个句型吗？becauseof是介词短语 ，后面跟名词或代词，because 后面跟完整的句子，这里考察它们的区别。，有疑惑记着再问。