I would like to know how can I know the exact meaning of "as" in any sentences. I always doubt what is the real meaning. For example, because, when, like, in the measure of etc.
Thank you
Welcome to the forums. This is a huge subject, have a look at this link: Definitions of as - OneLook Dictionary Search the Cambridge entry is particularly helpful, with a lot of sample sentences for each of the different uses of "as".