情态动词的语法特征有如下：
1) 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。
2) 情态动词 除ought 和have 外，后面只能接不带to 的不定式。
3) 情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。
4) 情态动词没有非谓语形式，即没有不定式，分词，等形式。
上一篇： 比较may和might
下一篇： so和such的区别
Beijing stalled on top of traffic jam list
First brush with the iPad mini
More officials probed for graft
Political horse trading
Cell phones pinpoint locations
China lodges protest over Dalai Lama's Japan visit
Japanese columnist caught in university fib
Navy completes military exercise in the Pacific
别误会这些英文(八)
Joined at the hip?
Secret talks held over Diaoyu Islands
Jack of all trades?
'Pandas' hot to globe-trot
Superstorm getting stronger
Last word?
Survey shows Chinese workers stressed out
Heat ring in new season
Storm strands tourists at Great Wall, killing 3
Hurricane affects early presidential voting
Kennedy cousin denied parole for killing girl in 1975
Beijing, Shanghai flights canceled
Man's passion documents bicycle culture
Voters finally cast their ballots in cliffhanger presidential race
Grad school graduates applying for menial jobs
Rarest of whales washes up in NZ
Storm revives issue of climate change
Heat on ahead of schedule
Superstorm batters East Coast, killing 16
Shenzhen Metro disruption leads to calls to ban Wi-Fi devices on subways
China-bashing ad takes voters for a ride