Lesson 4,How Many Books Are There,1.Greetings 2.Freetalk 3.Review (词汇.方位介词.数字,Step1 :class opening and review,Step 2. Numbers,1 One 2 two 3 three 4 four 5 five,6 six 7 seven 8 eight 9 nine 10 ten,11 eleven 12 twelve 13 thirteen 14 fourteen 15 fifteen,16 sixteen 17 seventeen 18 eighteen 19 nineteen 20 twenty,30 thirty 40 forty 50 fifty 60 sixty 70 seventy 80 eighty 90 ninety 100 one hundred,找规律,13-19 数字结尾加 teen 整十结尾加 ty 几十几就是整十加个位数字 发音，十几后为长音，几十后为短音,Seven days,Twelve months,How many months in a y
