skateboards/motorbikes - exciting
Skateboards are as exciting as motorbikes.
houses/skyscrapers - high (x)
Houses aren't as high as skyscrapers.
bikes/motorbikes - noisy (x)
Bikes aren't as noisy as motorbikes.
you/your brother - intelligent
You are as intelligent as your brother.
swimming with sharks/swimming with dolphins - safe (x)
Swimming with sharks aren't as safe as swimming with dolphins.
playing tennis/playing videogames - boring (x)
Playing tennis isn't as boring as playing videogames.
planes/helicopters - dangerous (x)
Planes aren't as dangerous as helicopters.
buses/trains - expensive (x)
Buses aren't as expensive as trains.
planes/trains - comfortable
Planes are as comfortable as trains.
cars/taxis - fast
Cars are as fast as taxis.