it is too heavy for me to lift 这个句子成分怎么划分

其实这句话顺序应该是这样:To lift is too heavy for me。成分:to lift (真正主语)is (谓语be动词)too heavy (表语)for me (介词短语)it is在这里只是作为形式主语有时主语太长,可用it作形式主语,将真正主语放在后面。如：It is fun swimming in a river or lake in summer。