They improved with each passing year.
I don't think they ever started improving they always have been
One way in which people are improving the environment is by driving electric cars.
The past tense of the sentence "They sell cars" is "They sold cars." In this form, the verb "sell" changes to "sold" to indicate that the action occurred in the past.
cars today have spinners and nitrous
Her study skills were improving.
I think that cars will still be existing but they will not be that popular. Since technology is improving, better transport will be made.
Solar powered cars are cars that are powered by the sun. when the sun is not out the car will not start, when the sun is out, it will start!
I saw lots of cars drive past.
What the hagbag do you mean.......What Cars start with you? HHAHAHAHAH...you need to work on your vocabulary!
Most cars that I know of start with a key.
2001
The past tense is started.