Are these sentences true or false?

Solution:

1. Planes are cheap. - False (Planes are generally expensive due to operational costs, maintenance, and ticket prices.)
2. Planes are faster than trains. - True (Commercial airplanes typically travel at speeds significantly higher than trains.)
3. Motorbikes are slower than bikes. - False (Motorbikes are generally much faster than bicycles due to their engines.)
4. Trains are more expensive than buses. - False (This can vary greatly, but typically bus travel is cheaper than train travel, especially for shorter distances. For long-distance or high-speed rail, trains can be more expensive.)
5. Buses are cheaper than helicopters. - True (Helicopters are very expensive to operate and generally used for specialized purposes, not mass transit.)
6. Ships are more comfortable than bikes. - True (Comfort levels are subjective, but ships offer amenities and space far beyond that of a bicycle.)
7. Buses are faster than planes. - False (Planes are significantly faster than buses.)
8. Trains are smaller than boats. - False (Trains, especially freight trains, can be much larger and longer than most boats. Passenger trains also have substantial volume.)