第四单元 Look at the T-shirts. 1.重点单词look at T-shirt they but too big shorts nice trousers dress coat shirt and 2.重点短语 look at blue and white too big your dress 3.重点句型Look at the T-shirts. .I like the red one. Its too big. -Is this your dress.Helen? -Yes.it is./No.it isnt. 4.语法:学习以 “Is this?”开头的句型及其回答。