1、概念:表示經(jīng)常發(fā)生的情況;有規(guī)律出現(xiàn)的情況;總是發(fā)生的;事實(shí)真理。
2.時(shí)間狀語(yǔ): Always, usually, often, sometimes, every week (day, year, month…), once a week (day, year, month…), on Sundays (on Mondays…), etc.
3.基本結(jié)構(gòu):主語(yǔ)+動(dòng)詞原形(如主語(yǔ)為第三人稱(chēng)單數(shù),動(dòng)詞上要改為第三人稱(chēng)單數(shù)形式)
4.否定形式:主語(yǔ)+am / is / are+not+其他;此時(shí)態(tài)的謂語(yǔ)動(dòng)詞若為行為動(dòng)詞,則在其前加 don't,如主語(yǔ)為第三人稱(chēng)單數(shù),則用 doesn't,同時(shí)還原行為動(dòng)詞。
5.一般疑問(wèn)句:把 be 動(dòng)詞放于句首;用助動(dòng)詞 do 提問(wèn),如主語(yǔ)為第三人稱(chēng)單數(shù),則用 does,同時(shí),還原行為動(dòng)詞。eg:①I(mǎi)t seldom snows here. 這里很少下雪。②He is always ready to help others. 他總是樂(lè)于幫助別人。③Action speaks louder than words. 事實(shí)勝雄辯。