【正文】 行時，構(gòu)成形式為be doing；主語“I”是第一人稱單數(shù)形式，故助動詞應(yīng)用am；help的現(xiàn)在分詞是helping。listen to聽；根據(jù)上文“I can’t hear you”，可知是因為正在聽演講，所以聽不到你說話，需用現(xiàn)在進行時，結(jié)構(gòu)為am/is/are doing。根據(jù)“Lucy, where is Mimi?”可知要回答露西現(xiàn)在正在做什么，應(yīng)該用現(xiàn)在進行時?？疾楝F(xiàn)在進行時的用法。根據(jù)“Where is your mother, Kitty?”可知，此處是詢問當(dāng)前的情況，表示正在做某事，用現(xiàn)解析：C【詳解】句意：——你媽媽在哪里，基蒂？——她正在廚房里做晚飯?？疾閯釉~時態(tài)?？疾閯釉~時態(tài)。解析：B【詳解】句意：喬，替我接電話。我正在做作業(yè)?？疾闀r態(tài)。故選C。故選C。 ——現(xiàn)在不行，我在幫我弟弟大衛(wèi)學(xué)數(shù)學(xué)。wait表一般現(xiàn)在時；am waiting表現(xiàn)在進行時；has waited表現(xiàn)在解析：B【詳解】句意：——媽媽，現(xiàn)在很晚了。結(jié)構(gòu)為：主語+will/shall+動詞原形、主語+am/is/are+動名詞。故選B?！纫粫?，我正在讀我的郵件。故選D。根據(jù)語境可知，此處指的應(yīng)該是正在準備做某事，表示正在進行的動作要用現(xiàn)在進行時，結(jié)構(gòu)是“am/ is/ are doi解析：B【詳解】句意：——那個糟糕的噪音是什么？——學(xué)生們正在準備聚會。wear穿；根據(jù)“I’ll have it changed immediately解析：B【詳解】句意：——Lena，我想今天早上你很匆忙。根據(jù)“Where is your father, David?”可知，此處是詢問當(dāng)前的情況，強調(diào)動作正在進解析：C【詳解】句意：——大衛(wèi)，你爸爸在哪里？ ——他正在花園里洗車?？疾閯釉~時態(tài)辨析。now現(xiàn)在，是現(xiàn)在進行時的標(biāo)志，需用be doing結(jié)構(gòu)；主語students復(fù)數(shù)人稱，be動詞用are，故選C。故選B。7．B【詳解】句意：——約翰在哪里？——他在廚房里。根據(jù)“now”可知要用現(xiàn)在進行時，其結(jié)構(gòu)為be doing。句中“Listen”是現(xiàn)在進行時態(tài)的標(biāo)志詞，其結(jié)構(gòu)為am/is/are+動詞現(xiàn)在分詞，主語“The birds”是復(fù)數(shù)，be動詞用are，故選C?？疾閯釉~時態(tài)。她正在圖書館看書。由“I really need to go now. My children…for me at school”可知，因為孩子們正在學(xué)校等我，所以我真得要走，故本句為現(xiàn)在進行時態(tài)。s go to the cinema. There’s a new movie called Avengers IV. —Not now, I _____________ my brother David with his math.A．help B．helped C．a(chǎn)m helping D．have helped19．It dark. Shall I turn on the light？A．gets B．got C．is getting D．was getting20．—Tom, please give me a hand in moving the piano. —Sorry. I ________ my car.A．repair B．repaired C．a(chǎn)m repairing D．have repaired21．—Tina, let’s go out for shopping.—Sorry, Amy. I __________ my homework.A．do B．a(chǎn)m doing C．did22．Joe, answer the phone for me. I ________ how to make dumplings in the kitchen.A．learned B．a(chǎn)m learning C．have learned D．learn23．— Mom, I’m busy making the bed. Can you give me a hand? — Wait a moment. I ________ the floor.A．a(chǎn)m cleaning B．will clean C．was cleaning D．have cleaned24．—What is your mother doing, Linda? —She ________ dinner in the kitchen now.A．is cooking B．was cooking C．cooks D．cooking25．—Where is your mother, Kitty?—She ________ dinner in the kitchen.A．cooks B．cooked C．is cooking D．will cook26．—How do you find your pany?—A little worried. We ________ ground as a leader in the field of IT with the others speeding up development.A．a(chǎn)re losing B．were losing C．lost D．have lost27．—Lucy, where is Mimi?—She ________ under the chair.A．sleeps B．slept C．is sleeping D．will sleep28．I can’t hear you. I ______ to an English speech.A．a(chǎn)m listening B．listen C．was listening29．—What about going to the cinema? There’s a new movie called Hi, Mom.—Not now, I ________ my brother Tony with his English.A．help B．helped C．a(chǎn)m helping D．have helped30．—I _______ a book report now. Can I talk to you later?—No problem.A．write B．wrote C．a(chǎn)m writing D．was writing31．—Mary, may I use your ipad for an hour?—Sorry. I ________ on it.A．work B．a(chǎn)m working C．have worked D．worked32．Don’t make any noise, Jim! Your little sister ________ now.A．sleeps B．