如何区分惯用语俚语和口语词汇

　　When reading, I m always confused with idioms, slang and colloquial words. Please tell me how to distinguish them.
　　An idiom is al fixed phrase the meaning of which bears no relation to the meanings of the individual words that make up the phrase. Phrasal verbs can often have literal or idiomatic meanings:?
　　The teacher told me to sit up.
　　We re going to sit up all night during the general election.
　　Apart from phrasal verbs, there are numerous expressions which are idiomatic. For example:
　　John imagines he ll be a millionaire before he s 25, but that s just pie in the sky.
　　Deal with the problem now. Remember, a stitch in time saves nine.
　
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