6．编号的表达

1）事物名词（不加冠词）+基数词。如：Lesson One，Part Three，Channel Five，Gate Nine,，World War Ⅱ

2）定冠词+序数词+事物名词。如：the first lesson，the third part，the fifth channel，the ninth gate，the Second World War

7．加减乘除的英语表达

plus/and加，minus减，time/multiplied by乘，divided by除。如： 

1）12 +8=？      How much is twelve plus/and eight? 
2）40—11=29， Forty minus eleven is/equals twenty nine.
3）3×6 =18，    Three times six is/equals eighteen.
4）56÷7=？       How much is fifty-six divided by seven?