This is a[backpack]变否定句、对画框部分提问、变复数句RT

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Thisisa[backpack]变否定句、对画框部分提问、变复数句RTThisisa[backpack]变否定句、对画框部分提问、变复数句RTThisisa[backpack]变否定句、对画框部分提

This is a[backpack]变否定句、对画框部分提问、变复数句RT
This is a[backpack]变否定句、对画框部分提问、变复数句
RT

This is a[backpack]变否定句、对画框部分提问、变复数句RT
This is not a [backpack]
is this a [backpack]?
Thses are [backpack]s

This is not a backpack.
Is this a backpack.
These are backpacks.