It was two years later that ...与It was two years before...的区别是?两句那句是强调句式?为何会有这样的区别?before与later的用法有何不同?

It was proposed that the president (should) be elected for a period of two years.translate She said,It was the best two years of my life.改为间接引语 Was it two years ago that they first met?为什么要用that The picture has been here.It was here two years ago.用since该写句子 it was two years ago when i got to kown him(同义句） it is two years ___ ___ ___ __ __ him it was two years ago when i first saw the great wallit was two years ago when I first saw the Great wall=I saw the Graet Wall______the_______ ________ two years ago填空． Our city has changed greatly in the last two years..改为Our city is quite_ _what it was two years ago. l was two years old 的翻译 I was taller than two years ago ( )16．There was a ___snow lat night,and it is still snowing ___now.( )16．There was a ___snow lat night,and it is still snowing ___now.A.heavily,heavily B.heavy,heavy C.heavy,heavily D.heavily,heavy It was two years later that ...与It was two years before...的区别是?两句那句是强调句式?为何会有这样的区别?before与later的用法有何不同? It was 85 years还是 it has been 85 years? It was two years ago when I got to know him.（改为同义句）It is two years —— —— —— —— —— him. 选择：Gunpowder was discovered in the twelfth century,but___A.man did not put it to use in war two hundred years laterB.until two centuries more it was used in warC.not used in war until two hundred years laterD.in war did not use it two hundre ye I was a child two years ago.划two years ago My father was in beijing for two years.对for two years部分提问 My father was in beijing for two years.对for two years部分提问 he said it was 2 years since he had smoked?这句话对么?it was two years since he smoked 这是一个句型吧?呢么题目里的那句符合本句型么?谢谢