This is sam.<改为否定句>
this is her mother(改为一般疑问句) 2.lt is an ornge.(改为否定句)
sam is tall改为否定句,句意不变
Is Tom smarter than Sam?改为否定句
This is Sam's friend .变否定句
lt is Luck's dictionary. 改为否定句
lt is hot in summer 改为否定句怎么改
This is a clock改为否定句
This is my ruler (改为否定句)
This is my room 改为否定句
this is my friend.(改为否定句)
This is his pencil.(改为否定句)
this is my brother 改为否定句