all that we can do is to do sth.不是缺谓语吗?that we can do 做all的定语,如果省去定语就是all is to do sth,is to do 是非谓语,请问这个句子为什么正确?

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all that we can do is to do sth.不是缺谓语吗?that we can do 做all的定语,如果省去定语就是all is to do sth,is to do 是非谓语,请问这个句子为什么正确?
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all that we can do is to do sth.不是缺谓语吗?that we can do 做all的定语,如果省去定语就是all is to do sth,is to do 是非谓语,请问这个句子为什么正确?
all that we can do is to do sth.不是缺谓语吗?
that we can do 做all的定语,如果省去定语就是all is to do sth,is to do 是非谓语,请问这个句子为什么正确?

all that we can do is to do sth.不是缺谓语吗?that we can do 做all的定语,如果省去定语就是all is to do sth,is to do 是非谓语,请问这个句子为什么正确?
is是系动词,与 to do sth.合起来作谓语

不缺。
all that we can do是主语

all that才是主语,后面的we can do是修饰all that 的,跟形容词似的,所以正确啊。