天氣的種類: thunderstorm, hailstorm, tornado, sandstorm.blizzard.monsoon,humncane 風暴的組成部分: sand grain, snowflake crystal, raindrop, hail pelet 數詞的用法，例如:billion,trillion 介詞的用法，例如:in,on, over, into 連詞的用法，例如:and,so,until 情態動詞的用法，例如:can 并列句，例如: Weather cools and heats our planet so it is just rightfor life. 定語從句，例如: Monsoons are winds that change each season. 特殊疑問句，例如:What's happening?