The correct form of "two" in English is "two." This is the standard form used in both singular and plural contexts. The number "two" is a cardinal number, which is used to indicate quantity, and it does not change form based on the number of items being counted or the context in which it is used.

The reason for this consistency lies in the nature of cardinal numbers in English. Unlike ordinal numbers (which indicate order, such as "first," "second," "third"), cardinal numbers do not have irregular forms. This is consistent with the grammatical rules of English, where most cardinal numbers from "one" to "ten" are irregular in form, but "two" remains the same regardless of the context. For example, "I have two apples" and "There are two students in the class" both use the same form of "two.

Data from the American English corpus, such as the Corpus of Contemporary American English (COCA), supports this consistency. In the COCA, the word "two" appears in various contexts, but the form "two" is consistently used. For instance, a search for "two" in the COCA reveals that it is used in a wide range of sentences, from simple statements to complex narratives, and in all cases, the form "two" is employed without variation.

In conclusion, the correct form of "two" in English is "two," and this form remains consistent across different contexts and uses. This consistency is a reflection of the grammatical rules governing cardinal numbers in the English language.