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课件网) Grammar Key question Why do we need trees Unit 3 Trees and us 主题范畴：人与自然 Why do we plant trees Tip: Pay attention to the words in bold. We use the present continuous to show that something is happening now. 我们用现在进行时表明现在正在发生的事情。 1. 现在进行时的定义 ( The present continuous tense) ①表示现在(说话瞬间)正在进行或发生的动作。 如： The students are listening to the teacher. He is watching TV now. ②表示当前一段时间内的活动或现阶段正在发生的事情。如: We are working on a farm these days. I am writing a book this month. am /is /are + v-ing 现在分词的构成方式 主要动词 现在分词 例子 大多数动词 +ing feel→feeling 以-e结尾的动词 去e+ing write →writing 以-ie结尾的动词 去ie+ying die →dying 一些以一个元音字母+一个辅音字母结尾的动词 双写这个辅音字母+ing run →running wait _____ drive _____ sit _____ lie _____ waiting driving sitting lying fight _____ save _____ run _____ tie _____ fighting saving running tying 一般情况直接加 以e结尾去e加 辅元辅双写加 ie结尾改y加 Exercise I She He The boy They The girls be be be be be be am is is is are are sing wash does reads does watch TV. homework. books. exercise. the dishes. in the room. ing ing ing ing ing ing 请找找规律： 现在进行时标志词： now look listen 2、现在进行时的谓语结构 be + 现在分词 (V-ing) 3、与现在进行时连用的时间状语： at present 目前;现在 at the moment 此刻,现在 at this time 这时候 right now 此刻,现在;立刻,马上 now 现在 these days 这些天 提示语: look, listen 注意 我们通常不将一些动词用于现在进行时。相反，我们会把它们用于一般现在时。 I know the answer now. I am knowing the answer now. She is liking this poem. She likes this poem. I She He The boy They The girls am watching TV. is is is are are doing homework. reading books. doing exercise. washing the dishes. cleaning the room. 请找找规律：怎样变否定句和一般疑问句？ not not not not not not Are you 4、现在进行时的句式 1. 肯定句: 主语+am/is/are+V-ing +其它. 如: I am reading a book in the library. 2. 否定句：直接在am/is/are后加not 如：I am writing. I am not writing. 3. 一般疑问句及回答: 问句:直接把am/is/are提句首, 若原句有第一人称，把第一人称变成第二人称。 肯定回答: Yes, 主语 + be (be是要变化的，即am/is/are). 否定回答: No, 主语+ be + not. I am drawing a pig.(变一般疑问句，再作肯定回答和否定回答） --Are you drawing a pig --Yes, I am. / No, I’m not. 特殊疑问句： 特殊疑问词+ am/is/are +主语+V-ing ... What are you drawing 小结： P136 肯/否定句 一般疑问句 一般疑问句回答 特殊疑问句 句型转换 1.The girl is dancing in the room. （改为否定句） The girl _____ _____ in the room. 2.I am reading a book. （改为一般疑问句） _____ _____ _____ a book 3.Are they playing football （做肯定回答） _____, _____ _____. 4.Is she singing a song （做否定回答） _____, _____ _____. 5.My mother is cooking in the kitchen. （就划线部分提问） _____ _____ your mother _____ in the kitchen isn't dancing Are you reading Yes they are No she isn't What is doing Exercise 根据题目要求，完成下列句子。 1. They ... ...
