第1个回答 2013-04-26
He believes that learning grammar is the best way of learning a language.
第2个回答 2013-04-26
He thinks that grammar is the best way to learn English.
第3个回答 2013-04-26
He thinks that learning its grammar is the best way of learning a language.
第4个回答 2013-04-26
He thinks studying grammar is a best way of learning a language
第5个回答 2013-04-26
He thinks learing grammer is the best way to learn language.