句型转换（共5小题；每小题2分，满分10分）
What's this? It's a bus.（改为复数形式）
There is some milk in the glass.（改为一般疑问句）
Do it like that.（改为否定句）
He saw elephants yesterday.（改为一般疑问句）
She does her homework at 7:00.（改为否定句）