1、指现在经常或反复发生的动作或存在的状态,be am is are,其余人称动词用原形,1、+s 2 、以s x ch sh o结尾的+es 3 、辅音+y结尾的，把y变为ies,often, usually, sometimes, always ,every day in the morning/afternoon/evening, once a week, if与unless引导的句子,宾语从句中,单数第三人称动词参照变化规则,1我们经常骑车去上学。,We often go to school by bike, We often ride our bikes to school.,We do
2、nt often go to school by bike. We dont often ride our bikes to school.,Do you often go to school bi bike? Do you often ride your bikes to school?,2 我是一个老师.,I am a teacher.,Are you a teacher?,I am not a teacher.,3他每天晚上做他的作业。,He does his homework in the evening every day.,He doesnt do his homework in
3、the evening every day.,Does he do his homework in the evening everyday?,她有时教我英语。,She sometimes teaches me English.,She doesnt sometimes teach me English.,Does she sometimes teach me English?,1 Zhuoma 去年是个学生。,Zhuoma was a student last year.,Zhuoma wasnt a student last year.,Was Zhuoma a student last year?,2 他们昨天写了一封信。,They wrote a letter yesterday.,They didnt write a letter yesterday.,Did they write a letter yesterday?,3 你们两年前在西藏。,You were in Tibet two years ago.,You werent in Tibet two years ago.,Were you in Tibet two years ago?,如果他早起，他总是能赶上早班车。 如果你不努力学习，你考试会不及格。 很久以前有一位国王。,
