预约成功
一般现在时态否定结构:
1) 如果谓语部分是行为动词,在构成否定结构时,需要在谓语结构中的行为动词的前面添加助动词和否定副词:主语是第三人称单数时, 所添加的助动词是does, 其他主语,则在句子中添加助动词 do。
e.g. The earth doesn’t move around/round the moon.
e.g. They don’t arrive in Beijing tomorrow morning.
2) 如果谓语部分是be动词, 在构成否定结构时只需要直接在be的后面添加否定副词not。
e.g. He isn’t a physician.
e.g. There isn’t any paper on the desk.
一般现在时态疑问结构:简单提一下:
e.g. The earth moves around the sun. -- Does the earth move around the sun?
e.g. He is a physician. ? Is he a physician?
e.g. They don’t arrive in Beijing tomorrow morning.―Don’t they arrive in Beijing tomorrow morning?
练习与体会:
(卫生类C/B级文章:smoking)
(1)Smoke is a mixture of gases, vaporized chemicals, minute particles of ash and other solids. (2)There is also nicotine, which is powerful poison, and black tar. (3)As smoke is breathed in, (4)all those components form deposits on the membranes of the lungs.
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