when

[wowenglish1]

I wonder if there is any difference between 3 sentences.
1. When you buy a used car, you should check several things.
2. When buying a used car, you should check several things.
3. When you are buying a used car, you should check several things.

[billmcd]

I wonder if there is any difference between 3 sentences.
1. When you buy a used car, you should check several things.
2. When buying a used car, you should check several things.
3. When you are buying a used car, you should check several things.

No, except perhaps a slight but insignificant difference that in #'s 2&3 the "checking" should be done at the moment/time of purchase. In any case the difference among the three would be unnoticeable by the listener/reader and the statements would typically be considered a general caution to a buyer.

[Rover_KE]

Please make your thread titles more helpful. You're not limited to a single word.

When you buy a used car would have been good for this topic.

Rover