Both of these words have many different uses and meanings, but these are the ones which tend to confuse Spanish speakers the most: 'Like' means 'similar to', for example 'He swims like a fish' or 'She sings like an angel'. 'As' refers to a role, for example 'He went to Cuba as a tourist' or 'She works as a nurse'. 'As' is also used in comparative sentences, for example 'He's not as clever as his brother'.

In North America you will also hear some people pepper their sentences with the word 'like'. For example, "The weather today is, like, really bad". You may have noticed people using 'like' in this manner in many Hollywood movies or television shows. This is not standard English and I wouldn't recommend using 'like' in this manner.

we use like before a noun or pronoun ex:Sonia looks like her sister. we use as before subordinate clause ex In Australia they drive on the left, as they do in England.