Learning a language is a difficult task.为什么开头用learning而不用to learn?为什么这里要用动名词做主语？什么情况用动名词什么情况用不定式？

Learning---------country's. language.is. a. better I'm not learning a language. sarah enjoys learning a new language very much.对 learning a new language 提问 The best way of learning a language文章翻译 What do you think of learning a foreign language it is important learning a second language.纠错 He is interested in learning a _____ language like English 连词成句 exciting,learning,language,a,is,new learning a foreige language is to teach foreigners什么意思 language learning是什么意思 翻译some people asecond language easily.other people have trouble learning a new language. 我知道Learning a language is easy.这句是对的To learn a language is easy.和Language learning is easy.这两种说法对吗?为什么? 单选 3.Only______English doesn't mean_________the language.( )A.to learn,to单选 3.Only______English doesn't mean_________the language.( )A.to learn,to learn B.learning,learning C.learning about ,learn D.learning about ,learning A good memory is a great help in （ ）a language括号里应该填哪个?求理由A.learn B.learning C.learns D.being learning还有,learn a language和learning a language有什么区别?求讲解 Only____English doesn't mean ____the language.A.to learn,tolearn B.learning,learning C.learning about,learn D.learning about,having learned详解. Only____English doesn't mean ____the language.A. to learn,tolearn B. learning,learning C. learning about,learn D.learning about,having learned请说明理由!!!!!!!!! the.secret.to.language.learning language learning 为什么用ing