I have read his letter. He hasn’t cleaned the windows yet. You have already changed. They have never spoken to each other. Have you ever been to the USA?
5. 现在完成时常用的时间状语是
already, yet, just, recently，so far, ever, never, up to now, in the past years, over these years等。
现在完成时表示：1.过去发生的动作对现在造 成的影响和结果。强调现在的影响，和过去 无关，不和表示过去的时间状语连用。
3.They _h_a_v_e_c_o_o_k_e_d_(cook) the supper already.They _c_o_o_k_e_d__(cook) it half an hour
ago.
4.They _h_a_v_e_n_’_t b__o_u_g_h_t (not buy) the air tickets. They__w_i_ll_b__u_y__(buy) them tomorrow.
5. They _h_a_v_e__fi_n_i_sh_e_d____(finish)the work so far.
6. How long have
you _s_t_a_y_e_d__(stay) at home
already?
7. I h__a_v_en_’_t_r_e_a_d_(not read) the book before.
this morning.
现在完成时和一般过去时区别：
1.He _h_a_s_w__o_r_k_e_d__(work) out the math and
now he is explaining it to us.
2.He _c_a_m__e_(come) to our school last year.
2. I haven’t finished (not finish) the work yet.
3. I _h_a_v_e_h_e_a_r_d_____(hear) from my father recently.
4. Weh_a_v_e__b_e_en_(be) there many times in the past 3 years.
5. 常和现在完成时连用的状语有：
already, yet, just, recently,so far, ever, never, in the past years, over these
years等。
用括号中动词的适当形式填空
1. He _h_a_s_d_r_a_w__n_(draw) a picture of his pet dog already.
8. He has
just done (do) it.
9. My sister _w__a_lk_e_d__(walk) to school every day last year.
10.We _w__il_l_h_a_v_e__(have) an exam again sometime next
week. 11.Lucy _h_a_s_g_o_n_e__(go) to Shanghai. She _l_e_ft___(leave)
Li ming has just gone to the countryside to see his grandma.
翻译句子：
1.我已经修好了你的照相机。
I have already repaired you camera. 2.吉姆还未到中国旅行过。 Jim hasn’t travelled to China before. 3.迄今为止，李先生已经教过3000个学生。 So far, Mr Li has taught 3000 students. 4.近来，有些交换留学生已经从我们学校毕业。 Some exchange students have graduated from our school recently. 5.在过去的20年里，中国发生了很大的变化。 China has changed greatly in the past 20 years. 6.李明刚刚去乡下看望他的奶奶。
语法复习
现在完成时
一、现在完成时的构成
1. 现在完成时的肯定句句型
主语（第一,二人称单,复数）+have
（第三人称复数） +have
（第三人称单数）
+has
+过去分词
2现在完成时的否定句句型
主语+have/has+not+过去分词+…… 例如： I have not seen the movie yet. He hasn’t been to Beijing since then
3. 现在完成时的一般疑问句
句型 Have/Has+主语+过去分词+…. Have you finished the work? Has she arrived hhave/has+主语+过去 分词+……. How many times have you been to the Great Wall?