◆◇一般現在時和現在進行時
a.一般現在時：重複發生的習慣性動作和真理。
搭配的時間副詞：always often frequently usually sometimes every day every week every month occasionallyonce a month once a month once a year seldom rarely never
examples：
she goes shopping every week.
he reads business news every morning.
he seldom goes dancing.
the sun rises in the east and sets in the west.
susan loves chocolate.
b.表示一種狀態或性質
examples:
this tastes very good.
i don’t believe my eyes.
i need a car.
i hate this music.
c.在講述一個過去發生的故事時，有時可用一般現在時表示過去發生的一系列事情。-this use is called the“historical present”.如在看圖說話一類題時經常用到這一點。
examples:
一個美國人描述他到中國旅遊的經歷
my friend and i arrive at the capital air port in beijing on the morning of may 25 th , 1993. robert comes to meet with us in a taxi, and we drive to what is to be our apartment for nearly three. week. the drive is culture shock number one. we see people everywhere. also, beijing seems to be more modern than its has been written in all the books on china i have read. my friend and i are extremely astonished by the number of bicycles on the road, truly the kingdom of bicycles.
現在進行時：
a.正在進行的動作
常用的時間的動作：(right)nowat the(this)momentat present
examples：
robert is teaching at this moment。
mendel is working on the first draft of his essay。
i’m looking for my umbrella right now.
he’s enjoying a holiday right now.
b.表達在現在一段時間內重複發生的動作，但是動作在說話時不一定正在進行。
常用的時間副詞：these days nowadays today this semester/quarter this week/month/year
examples:
he’s relaxing this week.
he’s working as a librarian this semester.
c.對一類經常發生的事情所表達的強烈情感
常用的時間副詞：always forever constantly
examples:
he’s always complaining.(他怎么總是抱怨。)
you’re always dancing.(你怎么總是跳舞，是不是太多了吧。)
◆◇一般現在時和現在完成時
一般現在時：
表達的動作不表明動作從何時開始或已進行了多長時間。
examples:
helen and tom are happily married.
bruce listens to the news every morning.
現在完成時:
a.現在完成時所表達的動作正在進行,但句子總是表明動作是什麼時候開始的。
examples:
helen and tom have been happily married since their wedding day 60 years ago.
bruce has listened to the news all his life without missing a day.
b.與現在完成時常用的兩個詞: for and since
for:表示動作持續的時間。如:for two minutes/weeks/years；for several days/a long time/the past month而在一般現在時不能與之連用。since:表示動作從何時開始的.如:since 6:00/apr. 23/last week /the accident
◆◇現在進行時和現在完成進行時
現在進行時：表示一個正在進行的動作,但不表明動作從什麼時候開始的。
examples:
he is waiting over there.
matthew is study chinese in beijing.
現在完成進行時:
a.現在完成進行時表示一個過去開始的並且現在仍在進行的動作。
examples:
he has been waiting over there since 2:00.
for the last three months, matthew has been studying chinese.
b.現在完成進行時表示一個進行了很長時間並且剛剛完成了的動作。
examples:
oh, there you are! i have been looking for you everywhere.
c.與現在完成進行時搭配的時間副詞:
since, for, all/week/month/year, in the past week/few months/few years, recently, lately
◆◇現在完成時和現在完成進行時
現在完成時：可表明發生動作的具體數字和次數。
examples:
he has tried to pass the exam twice.
現在完成進行時：不表明發生動作的具體數字和次數。
examples:
he has been trying to pass the exam all month.
◆◇一般過去時和現在完成時
一般過去時:
a.表示一個過去已經完成的動作。
與之搭配的時間副詞:yesterday, last week, last year, at 5:30
examples:
last week i went swimming with tom.
b.表示在過去一段時間內反覆發生的動作,但現在已經結束。
與之搭配的時間副詞:last year, last weekend, last month.有時用this weekend, this year
examples:
i went to canada twice this year.
i attended a wedding party this weekend.
c.表示已完成的過去的一段活動
examples:
our family owned that house for generations. (we don’t own it now.)
現在完成時:
a.表示過去的一個動作但其發生的時間不確切或不知道。
常用的時間副詞有:ever, never, yet, still, already
examples:
linda still hasn’t finished her assignment.
stanley has already gotten bored with the life here in toronto.
have you ever gone to paris?
b.表示過去的一個動作或反覆發生的動作,其發生的時間仍在持續。
常用的時間副詞有:this week/weekend/month/year; in the past ten years; in my life; today
examples:
i have gone to the post office twice today.
eric has taken several courses this year.
c.表示現在仍在進行的動作,已知動作發生的時間和持續的時間。
examples:
our family has owned that house for generations. (we own it now.)
◆◇一般過去時和過去進行時
a.二者的區別在於一般過去進行時表示在過去某個特定時間正在進行的動作。
examples:
my brother was sleeping at 2:00 yesterday afternoon.
my neighbor’s dog was barking at 3:00 this morning.
b.二者的區別在於一般過去進行時表示在過去同一時間兩個同時進行的動作。
與之常用的時間副詞:while, as
examples;
robert was moving the lawn while susan was fixing the car.
as michael was visiting paris, robert was teaching english classes in beijing.
◆◇一般過去時和過去將來時
二者的區別在於過去將來時表示在過去打算做,但是沒有做的動作.而一般過去時表示為什麼沒有做的原因。
examples:
i was going to become a rock star but i didn’t know the right people in the music business.
◆◇一般過去時和過去完成時
二者的區別在於過去完成時表示在過去的過去所發生的動作。
examples:
mary was hungry because she hadn’t eaten breakfast.
charlie lost his way to the hotel although he had been there a few days earlier.
i realized that i hadn’t eaten a single french fry since i started my diet.
◆◇過去進行時和過去完成進行時
二者經常混用,其最主要區別在於過去完成進行時表示在過去某一時間“以前”正在所發生或持續的動作.而過去進行時表示在過去某一時間的“前後”正在發生或持續的動作。
examples:
he had been doing a good job for us until he got a job offer from another company. (he stopped doing a good job for us.)
he was doing a good job for us when another company offered him a job. (perhaps he stopped–or perhaps he continued.
he took their offer because we hadn’t been paying him so well.
he took their offer because we weren’t paying him very well. (his wage then was not high enough)
◆◇過去完成進行時和過去完成時
二者的區別在於過去完成進行時不能同某一確定的數量或次數連在一起,而過去完成時能夠連在一起。
examples:
過去完成進行時- -he said he had been losing a lot of weight.
過去完成時- -he said he had lost 20 ponds.
◆◇一般現在時和一般將來時
一般現在時在時間和條件從句當中表示刑事處分將來時的動作。
examples:
as soon as i save enough money i’ll buy a big house.
when he gets back home he will phone a friend in new york.
if it rains tomorrow we will cancel the camping trip.