定语从句在复合句中修饰名词或代词的从句叫定语从句

定语从句：在复合句中修饰名词或代词的从句叫定语从句This bottle is mineThe bottle is on the desk（合为一句）This bottle which （关系代词） is on the desk is mine 指人： who, whom, whose, that 指物：which， that关系副词：指时间：when指地点：where指原因：whyeg： The girl who /that is wearing a black jacket is Miss Wang 先行词：人eg： I met the girlYou like the girl （合为一句I met the girl whom you likeThe boy whose shirt is gray is very fateg:Do you remember the day when we had a partyeg:This is the hospital where where James was born eg:Thats the reason why I hit you*区分：must必须，应该+动词原形have to不得不eg：You must go outIts cold we have to stay home.*区分：must无时态变化have to/has to/had to 有变化eg： She has to open the doorWe had to clean class yesterday变否定mustnt绝对不可以禁止doesnt have todont have todidnt have to mean to do打算做某事mean doing sth 意味着 rYou dont need to water itYou neednt to water it *needn,t do 不必做don,t need to do不需要去做作业1笔改百2闯关353练习册L125-1264背L125课文