名词+不定式与名词+介词+-ing分词有什么区别?如 there is no necessary to buy/of b

名词+不定式与名词+介词+-ing分词有什么区别?如 there is no necessary to buy/of buying a new car.

名词+不定式与名词+介词+-ing分词有什么区别?看它有没有区别分为：
1、在有些名词后,用不定式或介词+ing 分词,意义无甚区别.如你所举的这例 there is no necessary to buy/of buying a new car
2、有些名词后带不定式,不带介词+ing 分词.如：He is under no obligation to do that.
3、另一些名词后通常带介词+ing分词,而不带不定式.如：Have you had much experience in teaching English?
总之,看是哪些名词来定.

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