student
The word 'Student' in German is used to refer to a person who is studying at a university or other higher education institution. It is a noun and can be used with both male and female students. The plural form is 'Studierende'.
The student is reading a book.
This sentence describes an individual, referred to as 'der Student', is currently in the act of reading a book. 'liest' is the present tense form of the verb 'lesen', which means 'to read'. 'ein Buch' means 'a book'.
The student (female) is writing a letter.
This sentence describes a female student, 'die Studentin', in the process of writing a letter. The verb 'schreibt' means 'writes'. 'einen Brief' is masculine and it means 'a letter'.
A student is studying in the library.
In this sentence, 'Ein Student' is described as studying in a library. 'studiert' is the present tense form of the verb 'studieren', which means 'to study'. 'in der Bibliothek' means 'in the library'.