所谓动名词,指的就是动词的进行时态在句中扮演名词的角色,充当主语,宾语,表语等.其作主语,宾语时,用形容词修饰,形容词充当定语.做表语时,用副词修饰,副词充当状语.
e,g Frequent reading broaden your horizon.(作主语）
I ’m busy doing my homewok.(作宾语）
He is terribly coughing.(作表语）
至于你的那句话：deep studying and understanding contributes a lot to .
这明显是一个动词进行时态充当并列主语的结构.而主语只能由名词或代词充当.修饰名词或代词只能用形容词,如你的例句.deep 作定语,同时修饰studying 和 understanding.
再举一例 Regular living shedule and exercising do good to your health.
同理：regular 作定语同时修饰living shedule 和 exercising.I’m busy doing my homewok.(作宾语）这里怎么是做宾语？Sorry,I've made a mistake. I'm busy doing my homework.一句中doing my homework 是动名词短语作表语。再举一个作宾语的例子吧：I hate watching TV series！/ I like flying kites.上述两句中，watching TV series和flying kites 都是动名词短语作宾语。您能看出错误，说明您很耐心细致地看了，是个爱学习的人! 一起加油吧！