- You look unhappy - what is the matter? (NOT You look unhappily.)
We can use a few noun phrases after look in the same way as adjectives.
- When she realized what she had done she looked a real fool.
- The room looks a mess.
- It looks like it is going to rain. (NOT It is looking like ---)
- She looks like her mother. (NOT She is looking like ---)
- She looks as if she is dreaming.
Look as an ordinary verb
When look means turn ones eyes towards, it is used with adverbs, not adjectives.
- Look carefully. (NOT --- careful.)
Before an object, a preposition is necessary (usually at). A preposition is not used when there is no object.
- Look at him. (NOT Look him.)
- They were looking at some books.
- Look carefully - its changing colour. (NOT Look at carefully ---)
Look after and look for
- Could you look after the kids while I go shopping?
- She spent months looking for her lost dog.
Search the Dictionary of Practical English Usage