句型转换。
These are some orange pencil boxes. (改为单数) ___________ is an orange pencil _________.
That is my friend.（改为复数） ___________ __________ my friends.
My pencil is in the desk.（划线提问）___________ your pencil?
These keys are on the table.（改成一般疑问句）__________  __________ keys on the table?
I know his last name. (改为否定句)   I __________ know his last name. [