更新时间：2019-06-28 来源：中考英语 点击：
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1.延续性动词：how long，since，for，until / till等所在肯定句中的主句谓语要用延续性动词(以下划线部分)： We have been in Zhengzhou for ten years。
How long may I keep this novel? I’ve lived here since 2002.
Let’s wait until he comes back.. 但否定句中可用短暂性动词，如下面的see与leave：
I haven’t seen you for a long time. They won’t leave until it stops raining。
另外，请观察以下短暂性动词转换成延续性动词的常见表达：
lose →be lost. start / begin to do→do go off→be off
start, begin→be on turn on→be on move to→live in
end→be over get, buy→have, own borrow→keep
die→be dead go out→be out fall asleep→be asleep
get / become + adj →be + adj. open(动词，“打开”) →be open(形容词，表状态)
arrive in, get to, reach→be in, stay in leave, go away (from)→be away (from)
如以下例子的划线部分(并注意黑体部分的变化)：
The dog died five hours ago. →The dog has been dead for five hours。
I lost my dictionary two weeks ago. →My dictionary has been lost since two weeks ago。
He began to teach English last year. →.He has taught English for one year。
Lucy arrived in Beijing the day before yesterday. →Lucy has been in Beijing for two days。
I bought this bike six months ago. →I have owned this book since six months ago。
My friend borrowed the book last month. →My friend has kept the book for a month。
He left Beijing in 1990. →He has been away from Beijing since 1990.
(注意以上的“for + 时间段”与“since + 时间段 + ago”或“since + 时间点”可互换)
2.all / each / both / none / either / neither不定代词或形容词的用法：
1All boys / All of the boys are from China. (all 若接可数复数， 谓语也用复数。)
All of the water is polluted. (若接不可数，谓语用单数。)
2Each boy / Each of the boys has a different bag。
each接名词单数或接of + 限定词+复数，其后谓语都用单数。
3Both of the twins are clever. 后面谓语用复数。
4None of the students has / have been there before。
none +of +限定词+复数， 谓语用单、复数都可。另见88.
5-When shall we meet, Saturday or Sunday?
-Either day is OK. / Either of the days is OK. 谓语用单数。