¨NOUN¨

Ex: Learning is a complex process.

¨ADJECTIVE¨

Ex: They work on a very interesting experiment.

¨VERB as GERUND¨

Ex: Dr. Higuera is working in the lab.

¨INFINITIVES AFTER A PREPOSITION¨

Ex: We are capable of doing the assignment on our own.

¨PRESENT TENSE IN RELATIVE CLAUSE¨

Ex: All printed books belonging to the library must be returned.