教学目标：
a) The Ss should be able to ask for and give directions on the street
b)The Ss should know the usage of There be structure and Where questions
c) The Ss should remember some nouns and prepositions of location
词汇:
post office, park, bank, supermarket, pay phone, street, mail, across from, between, in front of, behind, there, avenue, bridge
重点:Is there a supermarket? Yes, there is. /No, there is not
难点:Is there a supermarket? Yes, there is. / No, there is not
Where is ……? It is in front of ……
