What we need to do is 后跟 "What we need to do is verify their nuclear declaration and we have put together a protocol that's based on international standards," Hill told reporters late Friday."I think there's a lot of support within the six-party

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What we need to do is 后跟

What we need to do is 后跟 "What we need to do is verify their nuclear declaration and we have put together a protocol that's based on international standards," Hill told reporters late Friday."I think there's a lot of support within the six-party
What we need to do is 后跟
"What we need to do is verify their nuclear declaration and we have put together a protocol that's based on international standards," Hill told reporters late Friday."I think there's a lot of support within the six-party process for getting this done."
系动词 is 后面似乎应该跟ing 或 to,但凭直觉似乎原型很合适.谁能解释一下这里为什么用原型?省略了to的不定式还是什么?
省略了to吗?为什么要省?语法上怎么解释?

What we need to do is 后跟 "What we need to do is verify their nuclear declaration and we have put together a protocol that's based on international standards," Hill told reporters late Friday."I think there's a lot of support within the six-party
应该是省略了to ,因为do前有to,此种情况下is后的to要省略,这是一种语法现象.

What we need to do is (to) verify their nuclear declaration
What we need to do is (verifying) their nuclear declaration
What we need to do is (verification of) their nuclear declaration
不能省略to,原句错误