e.g. The earth doesnt move around/round the moon.
e.g. They dont 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 isnt a physician.
e.g. There isnt 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 dont arrive in Beijing tomorrow morning.Dont they arrive in Beijing tomorrow morning?
练习与体会:
Smoke is a mixture of gases, vaporized chemicals, minute particles of ash and other solids. There is also nicotine, which is powerful poison, and black tar. As smoke is breathed in, all those components form deposits on the membranes of the lungs.
Ⅱ、一般过去时
1. 形式
1) 动词be除第一人称单数和第三人称单数用was外,其余一律用were。
2) 动词have一律用had。
3) 行为动词过去时的形式分两种:规则动词和不规则动词。前者由动词原形+d构成,如worked, used, studied, stopped等,后者如made, said, wrote等,属于不规则的构成形式, 须逐个记忆。
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