分析一句英语的句式结构The light source must therefore be immensely brig

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  • The light source must therefore be immensely brighter (主系表)

    这是主句,the light source为主语,must be 为谓语动词,brighter为表语

    therefore 和immensely为状语

    if it is to be used as a headlight to illuminate the path

    if it is to be used as a signal to others

    两个条件状语从句为比较对象.

    整个句子的意思:因此这种光源,如果被用作头灯来照亮路,比把它用来作为给别人的信号一定要明亮得多.