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怎样将下列复合句改为简单句,每空一词

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怎样将下列复合句改为简单句,每空一词
1、We don't know we should do next.
We don't know ( ) ( ) do next.
2、He forgot when he should start.
He forgot ( ) ( ) start.
3、I'm thinking about how I can mend the mechine.
I'm thinking about ( ) ( ) ( ) the mechine.
4、She doesn't know where she can find a pen friend.
She doesn't know ( ) ( ) ( ) a pen friend.
5、We can't decide which computer we should buy.
We can't decide ( ) ( ) ( ) buy.
怎样将下列复合句改为简单句,每空一词
1.what to 2.when to 3.how to mend 4.where to find 5.which computer to