1. Inside means within something else.

Pattern: verb + noun + inside + noun
There are some little toy animals inside the box.
She put the money inside the envelope.

2. Inside (adverb) means indoors, within a building.
It started to rain, so we went inside.

Fact
Australia has had stamps that actually look like gems. In 1995 and 1996 they used a special technology to make the stamps look like diamonds and opals.      .. More >>