裸不定式

没想到还有这种用法：

“What I need it to do is to call those functions on a host class” 和 “What I need it to do is call those functions on a host class” 都是正确的。

在英语中，动词不定式在这种结构中可以省略“to”。这种省略被称为“裸不定式”（bare infinitive），在句型 “X is Y” 中尤其常见，其中 X 和 Y 具有相同的动词含义或逻辑时，裸不定式表达更加自然。因此，两种写法没有实质性差异，都可以接受。

例子

这种“省略 to 的不定式”在一些结构中确实很常见。以下是几个类似的例子，都是在 “X is Y” 结构中省略了 “to” 的情况：

1. What you need to do is press the button.

• 全写形式：What you need to do is to press the button.

1. All I want is make a difference.

• 全写形式：All I want is to make a difference.

1. The best way to improve is practice every day.

• 全写形式：The best way to improve is to practice every day.

1. What he tried to do was help them.

• 全写形式：What he tried to do was to help them.

1. My goal is learn something new each day.

• 全写形式：My goal is to learn something new each day.

1. All she did was ask for a chance.

• 全写形式：All she did was to ask for a chance.

总结

神马都是浮云， 凡所有相皆是虚妄 何必跟虚妄较真呢