Like and As
Hi! I'm Tim from BBC Learning English, here to tell you about two words we use to say that things are similar.
We use like as a preposition before a noun or pronoun, and it means 'similar to'. He ran like the wind. Not: He ran as the wind.
We use like, and not as, to compare appearances. This house looks like a castle.
As can be used as a preposition. It means 'in the role of'. Dan, as your friend I have to say you're not a good singer.
We often use as to talk about people's jobs. I work as an actor.
Be careful using like and as because the meaning can change: As your brother, I'll try to help you means 'I actually am your brother'. Change it to like, and it means 'I'm not your brother but I want to act in a similar way'.