Translate: I have a big nose.

Is it: Tengo la nariz grande.

or : Tengo una nariz grande.

My teacher says you must use el, la, los, and las with body parts.

Tengo la nariz grande,

To determine the correct translation, you need to consider the gender of the noun "nose" (nariz). In Spanish, "nose" is a feminine noun.

Thus, the correct translation would be:

"Tengo una nariz grande."

In Spanish, the indefinite article "una" is used before feminine nouns.

Regarding your teacher's statement about using "el," "la," "los," and "las" with body parts, they are correct. These are the definite articles in Spanish, and they must be used when referring to specific body parts. For example:

- La nariz (the nose)
- El ojo (the eye)
- Los brazos (the arms)
- Las piernas (the legs)

Therefore, when talking about a specific body part, you would use the corresponding definite article. In this case, if you were talking about "the big nose," it would be "la nariz grande."