改错:This is all what they did.这句话错在哪裏?

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改错:Thisisallwhattheydid.这句话错在哪裏?改错:Thisisallwhattheydid.这句话错在哪裏?改错:Thisisallwhattheydid.这句话错在哪裏?all是

改错:This is all what they did.这句话错在哪裏?
改错:This is all what they did.
这句话错在哪裏?

改错:This is all what they did.这句话错在哪裏?
all 是代词,做表语从句的连接词应该用that而不是what.

what 改为that

all 和what都是代词,或者改成all that,或者把all 去掉