John can skateboard two times faster than David.(保持句意不变)

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John can skateboard two times faster than David.(保持句意不变)
John can skateboard two times_more quickly than _ David.

两句就差在一个用“faster”,一个用“more quickly ”
都是比较级,差别是两者比较级的变化形式不同.
问题在于,变比较级,什么时候加“-er”什么时候在单词前加“more”
形容词比较级形式变化有规则的和不规则的两种.
规则变化
1）单音节词末尾加-er（比较级
【例】原级比较级
great greater
small smaller
clean cleaner
2）单音节如以e结尾,只加-r（比较级
【例】 fine finer
nice nicer
wide wider
3）闭音节单音节词如末尾只有一个辅音字母,须先双写这个辅音字母,再加-er（比较级）
【例】 big bigger
hot hotter
red redder
4）少数以-y,-er,ow,-ble结尾的双音节词,末尾加-er.以-y结尾的词如-y前是辅音字母,则变y为-i,再加-er.以-e结尾的词只加-r.
【例】 clever cleverer
narrow narrower
able abler
easy easier
5）其它双音节和多音节词皆在前面加单词more.
【例】 careful more careful
difficult more difficult
delicious more delicious
不规则变化（这个就要自己记住了）
原级比较级
good/well better
bad worse
many/much more
little less
far farther/further farthest/furthest
注：有些形容词一般没有比较级.如：right,wrong,woolen等.
形容词的比较等级的用法：比较级用于二者的比较.
【例】 Li Ping is older than Wang Hai.李平比王海年纪大.
There are more students in Class One than in Class Two.一班比二班学生多

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