He naturally drives his own car to work.

A, he is the third person of singular subject, and the predicate should be goes.

B, by, if you follow the car, you won't need anything in the middle. For example, it is wrong to rely on his own car, either by car or in his own car.

Although the car is very convenient.

Although the car is very modern.

Car has no reason not to add an article, which is expressed in the plural here.

There is no need to drive.

There is no need to go by car instead.

After to, connect with verbs and use there be sentence patterns.

Riding a bike is good for his health.

Changing to a reading bike is good for his health.

A.ride is a verb, and the subject should be in the form of gerund.

B.bicycle is countable, which is used as a plural number here.

This is a way to lose weight.

Change this is a way for him to lose weight.

Of is a preposition followed by a gerund verb.

No matter how difficult it seems, keep trying,

Change the handle to hard. This is a spelling mistake. I won't say any more.

I believe you.

Change it to I believe you

Trust sb. It means to believe what someone says, not to believe someone.

Trust sb. It means to trust someone