Are these sentences grammatically correct? tenemos tantos bolígrafos como ellas. son tan altos como nosotros.

I believe the correct sentence structure should go as followed.

"Tenemos tantos bolígrafos como ellas. Son tan altas como nosotros."

If your sentence means "We have as much pens as they do. They are as tall as us." ("They" in this case referring to a plural amount of individuals being of the female gender.)

However, there are better ways to rewrite the sentence in Spanish in order to sound more articulate and less choppy in my opinion.

Let me know in the comments if you have any questions or need any additional help! :)

specify what unit.

here are some random ones because you didn't give the words:

salsa : salsa, sauce

microndas/ microwave

refrigerador/ refrigerator

vinagre/ vinegar

microondas/microwave

colour/color

persona/person

i would have to know what the audios say as well with the question. : /