第一章时态。
英语中谓语动词的时态(tense)是一种动词的形式，不同的时态用以表示在不同的时间完成的动作或保持的状态。英语动词共有十六种时态，这里将重点讲解其中较常用的十种时态。
现以动词do为例，将英语十六种时态列表如下：
一、一般现在时( the present indefinite tense)
1. 用于表示客观事实， 现在反**生或习惯性的动作以及存在的特征、状态等，常与often, always, sometimes, usually, once a week, every day, seldom等时间状语连用。【例句】the earth revolves around the sun.
the students get up at six thirty every morning.
2. 表示按计划或安排好的将来的动作，常使用arrive, be, go, start, stay等动词。
例句】there is a dancing party tonight.
the plane arrives in beijing at three this afternoon.
3. 用在以as soon as, when, after, while, as, until, till, whenever, the monment, the
minute, immediately, directly等引导的时间状语从句中或以if, unless, as/so long as, in case, provided that等引导的条件状语从句中，代替一般将来时。
例句】i’ll ring you as soon as he comes back.
if it is fine tomorrow we will go swimming.
the machine starts running the moment the button is pressed.
l 注：if条件句中，有will出现时，will是情态动词，意义为“愿意”，“肯”。
二、一般过去时( the past indefinite tense)
一般过去时用于表示过去某时刻或某一时期内的动作或状态， 也可表示过去习惯性的动作。常与表明过去时间的状语连用，如yesterday, then, just now, last month, two days ago, in 1990, 或由when或while等引导的表明过去时间的状语从句。
例句】we met him last week.
where did you live when you were young?
he used to do fourteen hours a day.
l 提示：一般过去时不强调动作对现在的影响，只说明过去。
三、一般将来时(the future indefinite tense)
一般将来时用来表示将来某个时间会发生的动作或情况，也可表示将来反**生的动作或习惯性的动作。
例句】we shall (will) go to nanjing tomorrow morning.
he will take part in an important race across the atlantic.
the students will h**e five english classes per week this term.
l 提示：表示将来时态的其他形式与用法：
1．“be going to +动词原形”表示（能看出迹象）很快就要发生的事情或打算要做的事。
it is going to rain.
2．“be to +动词原形”表示安排好的动作或安排别人去做的事。
they are to meet in front of the hall.
you are not to bring any materials to the exam room.
3．“be about to +动词原形”表示即将发生的或正要做的事。
the conference is about to begin.
4．“be +现在分词”有时可表示按计划即将发生的一个动作，但仅适用于少数的一些动词（如arrive, come, go, le**e, start等）而且常跟表示较近将来的时间状语连用。
my friend is arriving here the day after tomorrow.
l 提示：在美国英语中第。
一、二、三人称都用“will+动词原形”
四、现在进行时（the present continuous tense）
现在进行时表示此刻或现阶段正在进行的动作。但表示后一种情况时，动作此刻不一定正在进行。
例句】we are ****** an experiment now.
steve is studying chinese in beijing.
另外，现在进行时也可用来给习惯动作加上赞赏或讨厌等感**彩。
例句】he is always cooking some delicious food for her family.
he is always finding fault with his employees.
l 提示：并非所有动词都有进行时，有些表示状态和感觉的动词通常无进行时，除非这类动词的词义发生变化。这类动词有：
be, love, like, hate, believe, think（认为）, feel, seem等。
例句】do you see anyone over there?
are you seeing someone off? （see… off 意为“为…送行”）
五、过去进行时(the past continuous tense)
过去进行时表示过去某一时刻正在发生的动作，或过去某阶段内正在发生或反**生的动作。通常带有一个表示过去时间的状语或状语从句或能通过上下文判断的过去时间。
例句】we were h**ing a preparatory meeting at two-thirty yesterday afternoon.
she was writing a composition when you came in.
bill was coughing all night long.
六、将来进行时(the future continuous tense)
将来进行时表示将来某时可能正在发生或持续的动作。
例句】i’ll be reading this time tomorrow.
most of the young people in the town will be meeting them at the station.
七、现在完成时(the present perfect tense)
现在完成时表示目前已完成或刚刚完成的动作，也可以表示从过去某一时刻发生，现在仍延续着的动作或情况。经常与for+一段时间或与since（+时间一点）引导的短语或从句连用，也可与一些表示不确定过去时间的副词连用，如already, before, ever, never, just, once, recently, yet, up to now, so far, thus far, up till/to now, in the last/past few years等。
例句】we h**e been to shanghai once.
they h**e already finished the task.
he has studied english for more than 10 years.
he has studied english since 1991/ since he was twelve.
so far everything has been successful.
八、过去完成时(the past perfect tense)
过去完成时表示过去某一时刻或动作之前已经完成的动作。在时间上，它属于“过去的过去”。在句中常有明显的参照动作或有表示“到过去某时为止”的时间状语，如by, before等介词或连词引导的短语或状语从句。
例句】by the end of the war, the small workshop had become a large factory.
the plane had taken off before we got to the airport.
they found that a stream had formed in the field.
l 提示：在由after, as soon as, before等连词引导状语从句的复合句中，由于连词本身已明确动作发生的次序，所以，这个从句也可以用一般过去时表示，不一定用过去完成时。
例句】students went out after the bell rang.
i informed him of the progress of the work as soon as i arrived here.
l 提示：在it is/ was the first/second/last time that …句型中，that后的从句谓语用。
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