++Unit2+I+think+that+mooncakes+are+delicious+SectionA+Grammar+Focus~4c 人教版英语九年级全册.pptxVIP

人教新目标GoForIt九年级英语全册;;if和whether的区别

二者在下列几种情况下不能换用：

1.宾语从句与ornot直接连用时，应用whether，不能用if。如：

Idon’tknowwhetherornothewillcometomorrow.

我不知道他明天是否来。

2.if意为“假如，如果”时，可以引导条件状语从句，而whether没有这个用法。如：

IfSimoncomesheretomorrow,I’llcallyou.

假如西蒙明天来这儿，我将打电话告诉你。;e.g.Whatabraveboy(Tomis)!

Whatanexcellentidea(itis)!

Whatbeautifulpictures(theyare)!

Whatdeliciousfood(itis)!

Howhappythechildrenwere!

Howcarefullyheisreading!?

Howtimeflies!

HowhewishedthatChang’ecouldcomeback!

;宾语从句的时态;根据括号内的要求完成下列各题。

1.小梅多么忙碌！她总是第一个来最后一个走。(完成句子)

__________________Xiaomeiis!Sheisalwaysthefirstto

comeandthelasttoleave.;e.g.Whatatallbuildingitis!

=Howtallthebuildingis!

?Howinterestingthestoriesare!

=Whatinterestingstoriestheyare!;宾语从句I;主句时态;Writesentencesusingthewordsgiven.;WhatdopeopledoonQingMingFestival?;Warmingup;S1tellsafactaboutQingMingFestival.;注意：时态不变

当引述的是客观事实、科学真理、现在习惯工作以及格言等内容时，时态不变：

Hesaid,“Lighttravelsmuchfasterthansound.”

Theteachersaidtous,“theearthgoesaroundthesun.”

;Activity:WhatdoyouknowaboutQingMingFestival?;TheseplantswillproducefoodandoxygenthatweneedtoliveonMars.

ScientistswilldevelopplantsthatcangrowonMars.

PeoplethinkthathumansonMarshavetowearspecialbootstomakethemselvesheavier.

WeallknowthatMarsisaplanetinthesolarsystem.

ThejourneytoMarscouldtakeonlyaveryshorttimeinspaceshuttlesthattravelathalfthespeedoflight.

SomescientistsdonotbelievethatthejourneytoMarswillbeverycomfortable.;二．根据汉语句子的意思完成下列英语句子

1.我们不知道我们能否在火星上种植植物。

Wearewondering_______________________________onMars.

2.我认为玛丽不会来了。

Idon’tthinkMary_______________________.

3.山姆给我说他准备去上海。

Samtoldmethathe__________________Shanghai.

4.我担心是否伤害了她。

Iamworriedabout___________________________.

5.汤姆