一般现在时
(1) 一般现在时表示经常性的动作或状态 一般现在时表示经常性动作或状态时,常与often,always,usually,sometimes,every day等时间状语连用.如：The shop opens at nine every day.这家商店每天九点开门.It seldom snows here.这儿很少下雪.(2) 一般现在时表示客观存在或普遍真理 Light travels faster than sound.光速比声速快.Food easily goes bad in hot weather.天气热时食物容易坏.(3) 一般现在时表示主语的特征或状态 The picture looks very beautiful.这幅画看起来很美.Air contains oxygen and nitrogen.空气含有氧和氮.(4) 一般现在时在时间和条件状语从句中表示将来的动作或状态 I'll tell her about it as soon as I see her.When does the train arrive?火车几点到?(5) 用于图片说明或剧本中的动作提示和背景说明 INSIDE THE SHELTER:Stockton slowly turns to face his wife.The angry screaming cries of the people ring in their ears even as they depart.防空洞中：斯道克顿慢慢转过身,面对他的妻子.那群人正在离去,而他们愤怒的尖叫声却还回响在他们的耳边.(6) 电视节目直播解说 It's Carter to serve- he needs just one more point.He serves.And Smith misses.What a great serve!So the championshipgoes to 19-year-old Harry Carter.该卡特发球了,他只需再得一分就赢了.他发球了,史密斯接球失误.多漂亮的发球!冠军属于了19岁的哈利-卡特.