once后面加现在完成时什么意思？ once后既可以使用一般现在时，也可以使用现在完成时。例如：Once you start，you will never give up.一旦你开始了，你就不要放弃.Once you begin to read it，。
交通安全英语作文 引导语：人们生活水平不断提高车的普遍也走进了每一个家庭中，在我们享受着车给予实惠与便捷同时，也让所有人经受着如猛虎的车祸带来种种不同伤害，因而交通安全就显得十分。
once(一旦)引导的过去时和现在完成时的句子 语法及例子 once用作连词时，意为“一旦…就…”，用于连接时间状语从句，相当于as soon as.如：Once you start，you will never give up.一旦你开始了，你就不要放弃.Once you begin to read it，you will like it.一旦你开始读，你就会喜欢它.Physics is easy to learn once you understand the rules.一旦你理解了规则，物理就不难学了.注意：once引导的是时间状语从句，从句要用一般现在时代替将来时.
以 The Education We Need 为题，写一篇不少于120词的短文。 What kind of education we have before？That is easy to know，because almost all people have been to school when they were kids.I still remember when I was a kid，。
创新的重要性英语作文 In the past，people tend to keep on the rail.No matter who doesn’t follow the rules，he would be criticized by the public opinion.Nowadays，with the rapid 。
