快速复习动词时态之法,急求!!!

发布网友发布时间：2022-04-30 00:11

共1个回答

热心网友时间：2022-06-26 22:07

动词时态是语法测试中一个很重要的方面。要掌握动词时态，必须弄清每一时态的基本时间概念及基本用法；更要弄清句中以什么时态为基点，从而理解一个时态与另一个时态在同一个句子中的交叉使用情况。
��（1）句中时态以现在时间为基点句中时态以现在时间为基点，那么句子中可以相互搭配的时态形式通常有：一般现在时、现在进行时、一般将来时、一般过去时、现在完成时、现在完成进行时等，但就时态的测试重点多在于现在完成时。
��如： You should have put the milk in the ice-box; I expect it ____ undrinkable by now.
A) became B) has become C) had become D) become
��句中第二分句中的时态基点为现在时（谓语动词expect），句中时间短语"by now"表示"到现在为止"，暗示动作已完成，故答案为（B）。

��（2）句中时态以过去时间为基点，句中可相互搭配的时态通常有：一般过去时、过去进行时、过去将来时、过去完成时、过去完成进行时等。
��如：Whenever we visited them, they ____ television.
��A) have watched B) watch C) had watched D) were watching
��句子时态的基点为过去时间，那么在句中与之相搭配的时态，从四个选择项的形式来看，有（C）和（D）。再根据whenever的词意，可以判断（D）为正确答案。

��（3）主要时态的时间状语提示词
��现在完成时： so far，by now，up to now，for，since，recently，lately，in the past few…，ring the last few…，etc.
��过去完成时：by the end of＋过去的时间，by then，up to then，etc.
将来完成时：by the end of ＋将来的时间
��在四级语法结构测试题中，以动词时态为测试对象的大多是对现在完成时、将来完成时、过去完成时的测试。
��例3 By the end of this month, we surely ____ a satisfactory solution to the problem.
��A) have found B) will be finding C) will have found D) are finding
��答案是（C）。这里由by引起的时间状语表示到将来某个时间为止，因此句子的谓语动词需用将来完成时。
��例4 We ____ our breakfast when an old man came to the door.
��A) just have had B) have just had C) just had D) had just had
��答案是（D）。主句的动作发生在从句之前，从句的时态是过去时，因此主句应用过去完成时。

��1．动词时态
��1) By the end of this year all but two people ____.
��aa�have left�will leave�will be leaving�will have left

��2) She will come to call on you the moment she ____ her work.
��aa�has finished�finished�had finished�will finish

��3) You will hardly believe it, but this is the third time tonight someone ____ me.
��aa�telephoned�has telephoned�telephones�should telephone

��4) The company ____ a rise in salary for ages, but nothing has happened yet.
��aa�promised�is promised�is promising�has been promising

��5) Is it likely that the scientists ____ a cure for cancer by the year 2050?
��aa�will be discovering�are discovering�will have discovered�have discovered

��6) This is the second time I ____ your beautiful country.
��aa�had visited�visited�am visiting�have visited