這個不是動名詞吧,eg. Drinking water is expensive here.這個Drinking water不是動名詞,而是形容詞+名詞啊我再舉例: Crying babies annoy me.難道Crying babies是一件事情?我上面的例子 drinking water我分別造形容詞+名詞跟動名詞好了: 前者Drinking water is expensive here.後者: Drinking water is good for you.可以換成It is good for you to drink water.跟 To drink water isgood for you.(虛主詞、動名詞、不定詞互換)難道你那一句可以改成 It is important to read tips whenyou are reading.(helpful沒打到不過無所謂)或是To read tips is important and helpful when you arereading. 嗎?不對吧或是一個分辨的辦法,我舉個更複雜的動名詞Eating breakfast early, 把eating去掉完全不一樣可是Drinking water is expensive here.把drinking去掉雖然不specific了,但是文法、詞類沒有變個人淺見
http://i.imgur.com/nUJ81pZ.jpghttp://i.imgur.com/c8AYl41.jpg另外,副詞子句不會影響主要子句,附屬子句去掉不影響的