The only language -easy -to learn is the mother language

The only language -easy -to learn is the mother language The only language is easy to learn is the mother languguage. The only language----is easy to learn is the mother tongue.A the only language that is easy to learn is the mother tongue The only language (that) is easy to learn is the mother tong 唯一容易学的语言 The only language easy to learn 为什么用easy不用easily which is the best way to learn a language? It is important to learn about the b_____ language. it is important to learn about the b______ language Which is the best way to learn a second language? learn the English language It is very easy to learn a foreign language