小学英语语法:Be的四功能
be是一个多功能动词,在初级英语里可见四种用法:
功能一,系动词be
be为连系动词,中心词义是"是",句型为"主+系+表"结构。be的形式常用am,is,are(现在式);was,were(过去式);will/can/may/mustbe(助动词/情态动词+原形);have/has/hadbeen(助动词+过去分词)等。如:
Tohelpanimalsishelpingpeople.(一般现在时)
Thetwinswereverybusyyesterday.(一般过去时)
Itwillbesunnytomorrow.(一般将来时)
Shehasbeenillforoveraweek.(现在完成时)
功能二,助动词be
助动词be,无词义,辅助主要动词一起在句中作谓语动词。用法如下:
1.be+doing:构成进行时态,有现在和过去两种进行时态。如:
Thegirlsisreadingandcopyingthenewwordsnow.
YoungTomwasalwaysaskingquestionsandtryingoutnewideas.
2.be+done:构成被动语态(主语是动作的承受者,done必须是及物动词)。如:
Teaisgrowninmyhometown.(一般现在时的被动语态)
Thisbuildingwasbuiltthreeyearsago.(一般过去时的被动语态)
Ourclassroomhasbeencleanedandtidiedalready.(现在完成时的被动语态)
Howcouldthiskindofcakesbemadeinyourhome?(含情态动词的被动语态)
Thatisadaynevertobeforgotten.(动词不定式的被动语态)
3.be+goingtodo,表示"打算或将要做某事",be有现在和过去两种形式。如:
Wearegoingtoplanttreesinthepark.
Ididn'tknowifshewasgoingtocomehere.
4.be+todo,表示"按计划安排将要做某事"。如:
ThenewshopisnottobeopenedtillnextMonday.
OnenightanangelcametoMaryandtoldherthatshewastohavethisspecialboy.
功能三,therebe
therebe句式为:therebe+主语部分+状语部分,表示"某处存在某物",be常用现在时,过去时和将来时等。如:
Oh,cool!Andtherearemanythingstosee.ThereisevenadeerparkinSanya.
Thereareabout80pyramidsinEgypt.
Willtherebeafootballmatchinyourschoolnextweek?
功能四,实义be
可以将be视为实义动词,因为它具有实际的词义,如"成为;做;发生;举行;逗留;到达"等。如:
Hisdaughterwantstobeadoctorforanimalsinhertwenties.
Kate'sbirthdaypartywillbeathalfpastsixthisevening.
JimhasbeeninChinaformorethantwoyears,buthehasnotyetbeentoYichang.






