Write the phrase in the preterite. los estudiantes que to conozco no van nunca conmigo.

When it asks for preterite, they only want to change the tense of the verb.

The conjugation of conocer / conozco in preterite terms IN YO FORM is

conocí

meaning "I knew"

when the outside temperature is too cold, an endothermic animal can generate heat by shivering. endothermic animals must eat much more often than ectothermic animals since it takes energy to maintain a constant body temperature.