• 动词原形- 动词过去式- 动词过去分词• see-sa源自-• eat-ate-
原 形 过去式 过去分词
do ---- did ---- done
go ---- went ---- gone
have ---- had ---- had see ---- saw ---- seen say ---- said ---- said find ---- found ---- found come ---- came ---- come write ---- wrote ---- written take ---- took ---- taken
world.
_H_ a_ve_you read the book before?
_H_a_s__she finished her homework?
过去式与过去分词
作业中错误最多的： • 6. Have you ever saw(see) him this
week? • 7. Have you ever ate (eat) Beijing duck?
speak ---- spoke ---- spoken
现在完成时的一些关键词
• so far（到现在为止）, • since（曾经） • yet（已经） • ever（曾经）, • never（从没有）
现在完成时
1. 从过去开始的动作,一直持续到现在, 应用现在完成时.
2. for +一段时间; since+具体时间; since +句子
5. He has studied here _si_n_c_e last month.
6. We have been here _si_n_c_e_ three o’clock.
7. I haven’t seen my grandpa _s_in_c_e_ 2008.
8. The boy has learned English _si_n_c_e_he was five.
现在完成时(一) 构成
现在完成时 用法
1.Have + 动词过去分词 2.Has +动词过去分词 1. 表示曾经做过某事 或已经做过某事 2. 表示某人的经历
常用状语 ever, already, yet
现在完成时态 构成：主语 + have /has +动词的过去分词
I _h_a_v_e_ been to Beijing 3 times . He _h__a_s _visited USA. Bob and I _h_a_v_e_ seen the film . They__h_a_v_e_ heard the news . Lucy __h_a_s_ ever wanted to travel around the
__si_n_ce__I came here
__si_n_ce__last Sunday
__fo_r___two weeks _s_in_c_ethree years ago __s_in_c_e__ last month
Fill in the blanks with “for’’ or “since”. 1. Uncle Wang has worked on the farm
一、用for和since填空。
__f_o_r__three hours __f_o_r___a week _s_in_c_e__three o’clock ___f_o_r __a long time
__f_o_r __two days
__s_in_c_e__1997
__si_n_ce__yesterday afternoon
_fo_r_ three days. 2. I have stayed at home f_o_r_ a day. 3. They have lived in GuiLin _si_n_c_e_two
years ago. 4. She has known this man _fo_r_ ten years.