英语动词时态、短语.请解释一下为什么要这样填空.(1) life is like walking in the snow,Granny used to say,because every step_shows_(2) the number of deaths from heart disease will be reduced greating if people_persuade_to eat more fruit and vegetables(3) it is reported that many a new house _is being built_ at present in the disaster area.
问题描述：
英语动词时态、短语.请解释一下为什么要这样填空.
(1) life is like walking in the snow,Granny used to say,because every step_shows_
(2) the number of deaths from heart disease will be reduced greating if people_persuade_to eat more fruit and vegetables
(3) it is reported that many a new house _is being built_ at present in the disaster area.
答
（1）第一个是一个客观事实,用一般现在时.因为每一步是单数（every step）,所以用shows
（2）if引导的条件状语从句,遵循主将从现的原则,即主句用将来时,if从句用一般现在时.
（3）many a 虽然表示很多个的意思,但是它作主语要看a（一个）主语也是单数,所以谓语动词用单数形式.