观察下列例句,将序号填入对应用法之后。 1.All the living things on the earth depend on the sun. 2.The plane usually takes off at 8:00 a.m. 3.Our teacher told us the earth goes round the sun. 4.He often gets up at 7:00 every day. 5.She is a student. 6.Tom is 17 years old this year. 7.Unless it rains tomorrow, the sports meeting will take place. 8. I will call you as soon as I go back home. 用 法 序 号 A. 经常性或习惯性的动作,常与表示频度的时间状语连用。 B. 表示客观事实或普遍真理。 C. 表示主语具备的性格、能力、特征和状态。 D. 在时间、条件等状语从句中,用一般现在时表示将来。