In Chinese, 很 is often required between a subject and an adjective even when you don't mean 'very.' 她很漂亮 can mean 'she is pretty' (not necessarily 'very pretty'). Without 很, the sentence implies comparison.
mistakes
Don't say *她是漂亮. Chinese adjectives don't need 是 (to be). Say 她很漂亮 instead.
