"The students speak English."
Translation:Las estudiantes hablan inglés.
"Estudiante" can be both masculine and feminine. Use "el/un estudiante" for the/a male student; "la/una estudiante" for the/a female student. For multiple students where every member of the group is female, use "las estudiantes." And for a group of all male students or a group with any mixture of female and male students, use "los estudiantes."