Big buildings are an impressive part of a city.这句为什麽用are不用is上面的这句话an是修饰part的吧,但是前面为什么要用负数的are,和后面的an不矛盾么?

a lot of,tall buildings,in,are,the,city,big,there（连词成句） Big buildings are an impressive part of a city.这句为什麽用are不用is上面的这句话an是修饰part的吧,但是前面为什么要用负数的are,和后面的an不矛盾么? Historic buildings are an important building block in the flow of our culture through time. 1.i mustn't be late for i have____with the boyA.an appointment B.a appointmentC.a notice D.an notice2.Along the broad street _____many modern buildings ,big shops and busy shoppers .A.see B.are seen C.seen D.seeing 3._______at London ,he was sent to China is a big country .There are lots of beautiful cities.Beijing is a very old city.It’s the capital(首都) of China.There are many beautiful old buildings in Beijing.Such as the Place Museum and the Summer Place .Shanghai is an exciting city.It this is a map of our school.there are sixThis is a map of our school.There are six buildings in our school:a library,an office building,a classroom building,a dining hall,a sports hall and a science building.In the middle of the school is a big playg Historic buildings are an important building block in the flow of our culture through time.为什么会用单数an important building block?但是用的可是buildings are 说明是复数。 1.there are over 200 languages in the world.(改为同义句) there are ____ ____ 200 languages in the world.2.are there any big buildings in beijing?(用twenty years ago 改写）____ ____ any big buildings in beijing twenty years ago? There are many a____ buildings in Beijing. The buildings are very tall改为感叹句 are tall no there buildings there造句 Are there any tall buildings?怎么回答? Are there any tall buildings是什么意思 They are buildings with tall trees around( They are buildings with tall trees around( )? The buildings are in poor condition 请教关于diminishing-balance method of depreciation的计算A college uses the diminishing-balance method of depreciation for its buildings.It uses a depreciation rate of 3%,which means that its buildings are depreciated over an average useful lif you are my big big