EX1:chuyển câu sau sang nghi vấn
1: there is an eraser on the table
...There isn't an eraser on the table.....
2: there are four window in the livingroom
...There aren't four window in the living room....
3: there is one table in the classroom
.....There isn't one table in the classroom...
4: there are some pens on the desk
.....There aren't any pens on the desk...
5: there are four poeople in your family
....There aren't four people in your family....
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