很管用的 考试都考这些

24. One great thing about Singapore is that the temperature is almost the same all year

round..this is because the island is so close to the equator. So you can choose to go whenever you like—spring, summer, or winter. 现在完成时句型举例： 1. 2. 3. 4. 5. 6.

Have you ever been to an amusement park? 你曾经去过游乐园吗?Yes, I have./ No, I haven‘t.

I have never been there. Me neither=Neither have I. 我也没有. Where is he? He has gone to the Beijing. How long has he been in Beijing? I have been a student here for a year. become）

=I became a student here a year ago. 7. 8. 9.

本单元语法讲解

现在完成时

1.现在完成时态表示过去发生的动作对现在造成的影响或结果。本时态标志词： already （―已经‖，用于肯定句中，放在have /has之后或句尾）； yet （―仍然‖―还‖，用于疑问句或否定句的句尾） just（―刚刚‖，放在have /has之后）； before（―以前‖，放在句尾）；

ever（―曾经‖，放在have /has之后） never （―从没有‖，在have /has之后） 例句：

1.Our teacher has just left. 2.We have studied English already. 3.I have not finished the homework yet. 4.He has never been to Beijing before.

2.某个动作从过去已经开始,一直持续到现在,还有可能持续到将来.动作的持续性要通过一段时间来表示一段时间的表达方法有两种:

for: +一段时间 for a year for two weeks for three years Since +过去的某一时刻, since nine since last week

Since +一般过去时态的时间状语从句 since you came ; since you got home.

注意：结束性动词不能和表示一段时间的时间状语连用,但是它们可以转换成相应的延续性动词. 1.直接用延续性动词

buy– have；catch(get) a cold –have a cold；borrow—keep；become—be；put on-- wear 2.转换成be+名词

join the army – be a soldier；join the Party –be a Party member； go to school– be a student 3转换成be+形容词或副词 die—be dead；finish – be over；begin—be on；leave—be away ； fall sleep – be asleep close – be closed come to/ go to/arrive at(in)+某地—be in(at) +某地

4.转换成 be+介词短语go to school– be in school ； get up_ be up； 现在完成时态常见标志词

（不能用come/arrive）

我从没去过水族馆.

我成为这的学生有一年了. （不能用

I‘ve never been to an aquarium.

He has been dead for two years.（不能用die）=he died two years ago. I have been a teacher since ten years ago(for ten years.) （不能用become）