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Hi,

I know he is used to refer to a man

or a person, whose sex is not known.

And

his is the possessive form of he.

I can write :

Tom mends his car. (I knew Tom is male)

But when I see a person mending the car from a distance, can I write :

A person mend his car.

I mean, can we use his as the possessive determiner of a person? If not, what is the correct one?

Thank you very much.
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Hello James,
The advice to use "he" to mean either a man or a woman is outdated. Many people would find it sexist and unacceptable. It's okay to use "they" or "their" as a 3rd-person singular reference.

Tom is fixing his car.

A person is fixing their car.

Note I changed two things:
1) We use the word "mend" for clothing (or relationships) but not for large mechanical items like cars.
2) The progressive form "is fixing" is better than "fixes" because the person is going it right now. The simple present is used for repeated actions. Tom fixes his car himself whenever it breaks down. He doesn't have to use a mechanic.
Comments  
Grammar GeekHello James,

The advice to use "he" to mean either a man or a woman is outdated. Many people would find it sexist and unacceptable. It's okay to use "they" or "their" as a 3rd-person singular reference.

Tom is fixing his car.

A person is fixing their car.

Note I changed two things:

1) We use the word "mend" for clothing (or relationships) but not for large mechanical items like cars.

2) The progressive form "is fixing" is better than "fixes" because the person is going it right now. The simple present is used for repeated actions. Tom fixes his car himself whenever it breaks down. He doesn't have to use a mechanic.

Hi Grammar Geek,

I got it now. Thanks you so much for your help.