How would you write the sentences “You [formal] need to study for English class” and "You [informal] need to study for English class" in Spanish? Write your two sentences in Spanish.

To write the sentences "You [formal] need to study for English class" and "You [informal] need to study for English class" in Spanish, you can use the following translations:

Formal: "Usted necesita estudiar para la clase de inglés."
Informal: "Tú necesitas estudiar para la clase de inglés."

To arrive at these translations, I'll break down the sentence structure and the key vocabulary:

1. "You [formal] need to study for English class":
- "You [formal]" can be translated as "Usted" in Spanish, which is a formal way of addressing someone.
- "Need" translates to "necesita."
- "To study" is "estudiar."
- "For English class" can be translated as "para la clase de inglés."

2. "You [informal] need to study for English class":
- "You [informal]" translates to "Tú" in Spanish, which is the informal way of addressing someone.
- "Need" remains the same, "necesitas."
- "To study" stays the same as well, "estudiar."
- "For English class" is still "para la clase de inglés."

So, the translations become:
- Formal: "Usted necesita estudiar para la clase de inglés."
- Informal: "Tú necesitas estudiar para la clase de inglés."

Remember that using formal or informal pronouns in Spanish depends on the level of familiarity or formality between the speaker and the person being addressed.