They help animals. i want to be a doctor. как правильно написать

By the time mum came home her con didin't had cooked the dinner.  

Did by the time mum came home her con had cooked the dinner?

Sandra didn't had been writing a report for three hours before she realized it was too late.  

Did Sandra had been writing a report for three hours before she realized it was too late?

This bridge didn't was built in 1953.  

Did This bridge was built in 1953?

Tom was reading a very interesting book while his dad didn't was watching a football match.

Did Tom was reading a very interesting book while his dad was watching a football match?

The car of the future is great! I think that in the future there will be no problems, everything will be convenient for people, for each person. Traffic will not be at all! A little congestion, the police will have to address, because there will be more opportunities for traffic. I'm going to write about it.

Of course, all machines in the future flying. So show in all interesting films, write in all good books. On our planet more and more people, even more, perhaps, aliens. Roads, of course, will not be enough, that will have to use the airspace. Yes, and hurry! Many of the helicopters - the rich know where the free space.

Cars (private) will be more compact, one or two seats. The shape will be streamlined, like a bullet. Or a race car, but not as sharp. All this for speed, and it will be, I think, space. The speed of light!

Inside the car everything will be very convenient. Salon of each machine will create individually, more precisely, customized to the person. The Windows of the car will be panoramic, a very beautiful view will open. On Board you can order food, watching movies. You can even fly on autopilot, but it's not so interesting.