②数一数狗有多少只腿

T:There are lots of animals in the world，Most animals have legs now，one dog has four legs，two dogs have eight legs

Eg：T:two dogs，S:eight legs

T:three dogs S：twelve legs

Step3 Dills&practice

1.Show students the PPT，use "there are/is"to describe the pictures

2.show the crayons：how many crayons are there？let's count（lead in crayon）

show studens the PPT: There are only nineteen crayons，but there are twenty children in the class（此处板书）

Step4 Learn the text

① Watch the cartoon with questions:

Q1：What did Ms Smart buy yesterday？

Q2：How many crayons did Ms Smart buy yesterday？

Q3：How many children are there in the classroom？

Q4：Did Ms Smart lose a crayon？

② Watch again and repeat two times

③Role play next class.

Step5 Consolidation