Don't let her watch so much TV.不要让她看这 么多电视。
二、可数名词与不可数名词
普通名词分为可数名词和不可数名词。 1．可数名词可以用具体的数词来修饰，也可以 用“数词＋计量名词 ＋ of ＋ 可数名词的复数形 式”来表示。如：three apples三个苹果；two bags of watermelons两袋西瓜 2．不可数名词没有复数形式，表示量时用“数 词 ＋ 计量名词 ＋ of ＋ 不可数名词”结构。如 ：a cup of milk一杯牛奶
6．There ___i_s____(be) some bread on the table. You can have some.
7．Would you like to buy some __s_a_lt____(salt), Mrs. Smith?
8 ． Both his uncle and his aunt are famous _sc_i_e_n_ti_s_ts_(scientist)．
9．How much _c_o_f_fe_e___(coffee) is there in the cup?
10．How many watermelons (watermelon) did you buy yesterday?
Ⅱ.按要求完成下列句子，每空一词。 11．You must listen to the teacher carefully. (改为祈使句) _L_i_st_e_n___ ____t_o___ the teacher carefully，please. 12．You can't pour the water into the pot. (改为祈使句) _D__o_n_'t___ __p_o_u_r___ the water into the pot. 13．I have two brothers. (对画线部分提问) __H__o_w___ __m_a_n_y___ brothers do you have? 14．There is a little honey in the fridge.(对画线部分提问) __H__o_w___ __m_u__ch___ ___h_o_n_e_y_ is there in the fridge? 15．There is a tomato in the box.(用three代替a改写句子) There __a_r_e____ three t_o_m__a_to_e_s_ in the box.
Let's watch the cartoon now.现在我们看卡通片 吧。
Let's/Let me祈使句的否定形式是Let's/Let me not…或Don't let's/let me …；“Let ＋ 第三人称” 的否定形式为Don't let ＋ 第三人称 …。如：
Let's not play soccer in the street.我们不要在街 上踢足球。
单元语法小专题(Grammar Focus) 语法精讲
一、祈使句
祈使句常用来表示命令、指示、请求、要求或建 议等。
1．当主语是第二人称you时，you通常被省略。 这种祈使句一般以动词原形开头。它的否定形式是在 动词原形前加Don't。如：
Be more careful next time.下次仔细点。 Come to school earlier next time.下次早点来学校。 Don't play computer games.不要玩电脑游戏。
在祈使句的句首或句尾加please，可以使祈使 句的语气更委婉。注意：在句尾加please时，要在 please前加逗号。如：
Please speak loudly.＝Speak loudly，please.请大 声讲话。
2．带有第一、第三人称主语的祈使句通常以 let为词。 16．请看第二幅图。 ___L_o_o_k__ ___a_t____ the second picture，please. 17．会议室里有几位工程师？ __H__o_w___ __m__a_n_y__ e_n_g_i_n_e_e_r_s are there in the meeting room? 18．凯特，请不要打开搅拌机。 Kate，please __d_o_n_'_t__ __t_u_r_n___ ___o_n____ the blender. 19．我们一起做香蕉奶昔吧。 __L__e_t'_s__ __m__a_k_e__ banana milk shake together. 20．我想要一杯酸奶和两个汉堡包。 I would like _a_/o_n_e_ _c_u_p_ __o_f__ _y_o_g_u_r_tand two _h_a_m_b__u_r_g．ers
3．可数名词的量可以用how many提问；不 可数名词的量可以用how much提问。
4．some，any，a lot of，lots of等既可以 修饰可数名词，又可以修饰不可数名词。
语法精练
Ⅰ.用括号内所给单词的适当形式填空。 1．__K__e_e_p__(keep) quiet in the library. 2．Don't _s_w__im____(swim) in the river，please. 3．Please don't __b_e_____(be) late for school next time. 4．You should not eat too much __m__e_a_t__(meat)． 5 ． They visited two big f_a_c_to_r_i_e_s_(factory) last month.