一、 定義與講解
一般現(xiàn)在時(shí)：表示經(jīng)常性的事情，經(jīng)常性的動(dòng)作或一般性事實(shí)。
時(shí)間狀語(yǔ)：often 經(jīng)常，usually通常，always 總是，every每個(gè)，sometimes 有時(shí)，at …在幾點(diǎn)鐘
只有在第三人稱(chēng)單數(shù)用動(dòng)詞的“三單變化”，其他用動(dòng)詞的原形。
三單變化：1.多數(shù)在動(dòng)詞后＋s play — plays like — likes
（1）直接在動(dòng)詞詞尾加-s.
ask---asks work---works get---gets stay---stays
（2）以字母s, x, ch, sh或o結(jié)尾的動(dòng)詞，在詞尾直接加-es.
　　watch---watches wish---wishes fix---fixes do---does
　　go---goes pass---passes
（3）以“輔音字母加 - y”結(jié)尾的動(dòng)詞，要先變y為i再加-es.
　　try---tries study---studies cry---cries fly---flies
　　2.不規(guī)則變化：
be---- is are have----has
二、一般現(xiàn)在時(shí)用法
　　1. 表示經(jīng)常性，習(xí)慣性,永久性的動(dòng)作或存在的狀態(tài).通常與副詞sometimes, often, usually, always, every day (year, month ), once (twice, three times) a day,等時(shí)間狀語(yǔ)連用。
　　They usually go to school by bike.
　　I take the medicine three times a day.
　　She helps her mother once a week.
　　Mary’s father is a policeman.
　　There are 50 students in my class.
　　2. 表示客觀真理，科學(xué)原理，自然現(xiàn)象，等客觀事實(shí)或格言，諺語(yǔ)等。
　　 The sun rises in the east and sets in the west every day.
　　 The man who has never been to the Great Wall is not a real man.
　　 Tomorrow is Tuesday.
　　三、一般現(xiàn)在時(shí)的句子轉(zhuǎn)換：
　　（1）當(dāng)句子中有be動(dòng)詞或情態(tài)動(dòng)詞時(shí)，則把be動(dòng)詞或情態(tài)動(dòng)詞(can,could等等)提到主語(yǔ)的前面變成疑問(wèn)句;在be動(dòng)詞或情態(tài)動(dòng)詞后面加not變成否定句.
　　 例：①陳述句：She is a student.
　　疑問(wèn)句→ Is she a student?
　　否定句→ She is not a student.
　?、陉愂鼍洌篒 can swim.
　　疑問(wèn)句→ Can you swim
　　否定句→ I can not swim.
　　（2） 當(dāng)句子中即沒(méi)有be動(dòng)詞，也沒(méi)有情態(tài)動(dòng)詞時(shí)，則在主語(yǔ)前加助動(dòng)詞do (you,以及復(fù)數(shù)), does（單數(shù)she,he,it）變成問(wèn)句；在主語(yǔ)后謂語(yǔ)動(dòng)詞前加助動(dòng)詞don’t（I,you,以及復(fù)數(shù)), doesn’t（單數(shù)she,he,it）變成否定句，助動(dòng)詞后的動(dòng)詞要變成動(dòng)詞原形。
　　例：①陳述句：We get up at 7:00 every morning.
　　疑問(wèn)句→Do you get up at 7:00 every morning?
　　否定句→We don’t get up at 7:00 every morning.
　?、陉愂鼍洌篠he has a little brother.
　　 疑問(wèn)句→ Does she have a little brother?
　　否定句→ She doesn’t have a little brother.