1.is的複數形式是are2.is 的過去式是 was 3.was的複數形式是were拓展：is vt.& vi. 是（be的三單形式）n.存在.高考過去式:was 雙語例句：
1.This man is an animal, a beast這人是個畜生，是個野獸。2.Clearly there is a problem here顯然，這裡出了個問題。3.This is a common fallacy which has no basis in fact.這是一個沒有事實依據的常見謬誤。4.Choosing the right type of paint for the job is half the battle.選對了塗料，這項工作就成功了一半。5.My life is ruined and I suppose I only have myself to blame.我的一生都毀了，我想這隻能怪我自己。6.I think that it is not coincidental that we now have arguably the best bookshops in the world.我認為我們現在擁有了可以說是世界上最好的書店，這並非巧合。7.Their purpose is to build a fair society and a strong economy他們的目的是要建立一個公平的社會和一個強大的經濟體。8.In business circles he is noted for his flair and clarity of vision.在商界，他的天賦和遠見卓識是出了名的。9.The new government"s first challenge is the economy.新政府面臨的第一個難題是經濟問題。10.This has fuelled speculation that heis about to clinch a deal with an American engine manufacturer.這更增添了人們對他即將和美國的一家發動機製造商達成協議的猜測。
1.is的複數形式是are2.is 的過去式是 was 3.was的複數形式是were拓展：is vt.& vi. 是（be的三單形式）n.存在.高考過去式:was 雙語例句：
1.This man is an animal, a beast這人是個畜生，是個野獸。2.Clearly there is a problem here顯然，這裡出了個問題。3.This is a common fallacy which has no basis in fact.這是一個沒有事實依據的常見謬誤。4.Choosing the right type of paint for the job is half the battle.選對了塗料，這項工作就成功了一半。5.My life is ruined and I suppose I only have myself to blame.我的一生都毀了，我想這隻能怪我自己。6.I think that it is not coincidental that we now have arguably the best bookshops in the world.我認為我們現在擁有了可以說是世界上最好的書店，這並非巧合。7.Their purpose is to build a fair society and a strong economy他們的目的是要建立一個公平的社會和一個強大的經濟體。8.In business circles he is noted for his flair and clarity of vision.在商界，他的天賦和遠見卓識是出了名的。9.The new government"s first challenge is the economy.新政府面臨的第一個難題是經濟問題。10.This has fuelled speculation that heis about to clinch a deal with an American engine manufacturer.這更增添了人們對他即將和美國的一家發動機製造商達成協議的猜測。