我来回答。动词的to do 与doing绝对可一做主语,若做主语,句子中的谓语动词要用第三人称单数形式。例如: Walking is good for your health.散步对你的健康有好处。Swimming makes me feel happy.游泳使我觉得开心。 To be a singer is my dream.做一名歌手是我的梦想。有价值的饿这么说。
something is valuabl.或者 something is of (great)value.因为of + 抽象名词= 形容词的意思 另外...