What is ir in the nosotros form?

Nosotros vamos.

What is the nosotros form of ser?

Quite possibly you mean the nosotros form of ser. The other way doesn't work because there is no ser form of nosotros. The nosotros form of ser is somos.

What is the plural of yo estoy in spanish?

I believe you mean "we" or "us", which in Spanish is nosotros.

Nosotros a la biblioteca ayer?

Nosotros fuimos a la biblioteca ayer.We went to the library yesterdayAnswer:Fuimos

How do you say nosotros in english?

Nosotros is the subject pronoun in Spanish meaning we. It is one of subject pronouns that you don't have to use all of the time. Let's say that you wanted to say, "We speak Spanish." The verb for speak is hablar. When you conjugate that in the nosotros form you get nosotros hablamos. Nosotros hablamos español means we speak Spanish. Hablamos español means the same thing, so it isn't used that often in that case, but it is used anywhere you want to say we. It can be yourself and a friend or yourself and multiple people, it is the plural of me or I.