Subject–verbagreement(主谓一致)Step1:语法一致原则,主语为单数形式,;主语为复数形式,谓语动词也用复数形式
Ioften________(help)himandheoften________(help)me
Weoften________(help)eachother
HeandI______(be)bothstudentsofthisschool
Timeandtide_______(wait)fornoman
单数名词、不可数名词、单个动词不定式短语、动名词短语以及做主语时,谓语动词要用单数
Tostartsmoking_____(be)quiteeasy,buttogiveitup_________(need)courage
Whetherwe’llgo__________(depend)ontheweather
名词复数;用and或both…and连接的名词、动词不定式短语、动名词短语及句子做主语时,谓语动词用复数
Swimmingandwalking________(be)goodexercise
Bothhismotherandhisfather__________(have)gonetheir
注意:1由and连接的两个词指同一个人、同一物、同一事或同一概念时,谓语用单数
如:breadandbutter,knifeandfork,ironandsteel,awatchandchain,aneedleandthreadTheknifeandfork_______(be)onthedesk
Thesecretaryandmanager_______(be)verybusynow
2由each…andeach…,every…andevery…,no…andno…,manya…andmanya…连接