It is a singular verb so you need to add an 's' to the end. This car functions rather well.

Hi Claudia! The SIMPLE PRESENT of the verb "to function" is as follows: I function you function he/she/it functions we function you function they function In the example you gave, "this car" corresponds to the 3rd person singular, you could substitute "this car" with the pronoun "it". Therefore, you need to add an "S" to the root of the verb (as for all the verbs in the 3rd person singular in the SIMPLE PRESENT). TO FUNCTION = FUNCTION + S = IT FUNCTIONS. - This car functions rather well. In the sentence you gave above, "function" would definitely be a verb. The meaning is as follows: If a machine/car or system is functioning, it is working or operating. source: https://www.collinsdictionary.com/dictionary/english/function As you can see in the link above, the word "function" can also be a noun, but it is not the case of the sentence you wrote in the example above. Just to clarify, there are no singular or plural VERBS, it is the PRONOUN that is either singular or plural: I = 1st person singular you = 2nd person singular he/she/it = 3rd person singular we = 1st person plural you = 2nd person plural they = 3rd person plural As you can see, the pronoun YOU can be either 2nd person SINGULAR or PLURAL, you have to understand from the context whether it's one or the other.

"Functions" rather well. Functions... means now... it works now.

Respected Madam, The word Function can be used in two forms. Such as in the form of Noun and in form of a Verb too. The Synonyms words used for Function are Purpose, Task, Role, Responsibility and duty and on other Hand as verb to. synonyms for Function are- Work, Operate, go and run. In both the situation as you thought of Noun and verb it appears in Present Form. So it will be suitable to use s with the word function and also the Noun is in Third Person Singular Number.