“I have a lot of things to do."have 后不是跟省略to的不定式吗?为什么还可以是to do?

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• “I have a lot of things to do."have 后不是跟省略to的不定式吗?为什么还可以是to do?
• 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？
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