The term 'be acquainted with' can be expressed in four different ways using the solutions of the crossword. The first solution is 'KNOW' which is a verb meaning to have information or understanding about something. The second solution is 'KNOWN' which is an adjective used to describe something that is familiar or has been identified. The third solution is 'knew' which is the past tense of the verb 'KNOW'. The fourth solution is 'knows' which is the present tense of the verb 'KNOW'. Therefore, the term 'be acquainted with' can be expressed as having knowledge or familiarity with something in the past, present, and future.