is not...dangerous...
A cat is not as dangerous as a tiger
is not...tall...
A rabbit is not as tall as an elephant.
is...colourful...
A bird is as colourful as a frog
is ... dark...
The sheep is as dark as the horse
Compare these two animals. Use (not) as... as.
The elephant is not as tall as the giraffe.
is not...big...
A fly is not as big as a beetle