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

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

This is a[backpack]变否定句、对画框部分提问、变复数句RT Is this your backpack?变复数要怎么变啊! This is a backpack.（对.backpack提问） This is ablue backpack.(改错为否定句)This a blue backpack.咋填 a backpack.A.That is B.This is This is a backpack in English（同上）划线部分：a backpack This is a black backpack改为同义句 this is a blue backpack改为一般疑问句 This is a blue backpack改为同义句 This is a backpack(改为复数句子)怎么改? Whose backpack do you think ____?A.THIS IS B,IS THIS What's this?This is a backpack这个句子有问题吗? is this your backpack?翻译成中文 This is my backpack.改成复数形式 This is his backpack.改成否定句 is this your backpack?翻译成中文 This is my backpack改为同义句 Who backpack is this?改正错句