Can we say:
I always go to work on my car.
or it should be rather:
go to work by my car
or
go to work in my car
Which one is the most correct?
Can we say:
I always go to work on my car.
or it should be rather:
go to work by my car
or
go to work in my car
Which one is the most correct?
If you sit on the roof of your car when you go to work, it's correct.
If, like the rest of us, you sit inside the car behind the steering wheel, you would say
I always go to work in my car.
When talking about modes or transport, you can use by
I always go to work by car
I always go to work by train
...note that there's no "my" here, because we are talking about a mode of transport not a particular vehicle.
If you are talking about how you get to work, then
go to work by ( my ) car
got to work in my car
would be correct.
However, if you are a mechanic and are often working on your car, then
I always go to work on my car ( on the weekends )
I work on my car on the weekends (AmE)
I work on my car at the weekends (BrE)
would be appropriate to say you are fixing or modifying your car during the weekends.
Welcome to the confusing world of English prepositions. English prepositions sometimes have very little definite meaning by themselves. Sometimes they help form familiar phrases which convey the intended meaning, and the phrase as a whole must be understood separately from the individual words. The following explanation is going to be confusing, but it will explain a lot about how English works.
In this sentence:
I always go to work on my car.
there are two familiar phrases competing for the word "work", each with a different meaning:
go to work
work on (some) car
"Go to work" has two common meanings: (1) to travel to the place where you do your job; and (2) to perform an intense activity that uses a special skill or ability, especially if the activity exerts an effect on something else. The first meaning is much more common and familiar. Meaning (2) is often intended when the phrase is followed by "on"; for example, "The icebreakers went to work on the St. Clair river" means that the icebreakers broke up the ice in the river.
To "work on a car" means to repair it, or to alter it mechanically (for example, by lowering the suspension or just by doing routine maintenance like changing the spark plugs).
For a person to hear "go to work" as the familiar phrase meaning "travel to my job", they would have to understand "on my car" in a way that makes sense with that meaning. As you will see below, "on my car" suggests a very unexpected meaning, so a listener will probably understand "I always go to work on my car" to mean that you "always" leave to perform mechanical work on your car or that performing mechanical work on your car brings out your skills and enthusiasm especially well.
Another familiar phrase is:
go by vehicle
This means to travel using the kind of vehicle mentioned. For example, "I go to work by car" or "I go to work by train." In this phrase, you never refer to a specific vehicle, only a kind of vehicle. So, it sounds wrong to say "I go to work by my car" because "my car" is a specific vehicle. That sentence suggests that the place where you do your work is near ("by") your car.
The most common meanings of:
do an activity on something
do an activity in something
are to do the activity while positioned on or inside the thing. In these phrases, the prepositions work the way they do in the Romance languages: they introduce an adverbial phrase that describes a spatial relationship between the verb and the "something"; they don't change the meaning of the verb.
So, in "I always go to work on my car", if a person hears "go to work" as meaning "travel to work", then the sentence would mean that whenever you travel to work, you are positioned on the roof of your car. That's probably not what you intended to say.
I always go to work in my car.
means that you are positioned inside your car while you travel to work, and presumably you are driving the car.
This all means that in order to learn English, you can't simply remember the meanings of individual prepositions. You have to learn entire phrases. When you know enough phrases, then you start to understand when they compete for a common word, and how to choose your words to prevent that competition.