单独的 much （原级）修饰动词通常只用于否定句和疑问句中，但是 more (...) than ...是可以用于肯定句的。例如：You should sleep more than you do . 你应该比现在睡得更多些。（《外研社基础英汉词典》more 词条）She seems to care ( far 或 much ) more for her dogs than for her children . 比起她的小孩，她似乎更喜欢她的狗。（戴炜栋主编《新世纪英汉多功能词典》 more  词条）在“you learned that phrasal verbs are used more when English is spoken than when it is written.”这个句子中，that phrasal verbs are used more when English is spoken than when it is written. 是宾语从句，全句的译文应该是：你发现讲英语的时候会比写英语的时候，更多地使用短语动词。 ”