1. Used at the beginning of a sentence to mean that what you are about to say is exactly like something else you or your partner has mentioned already. English = likewise, similarly, in the same way.
2. Used in a sentence to add another person, thing, or aspect to a previous statement, (ie the extra person etc. did the action also). English = too, as well, also.
3. Used in a sentence immediately before naming a person or thing after you have already described another person or thing. You mean that the first thing or person you talked about in the sentence shares the characteristics of the second thing or person, e.g., they look similar, they do something (or behave) in a similar manner. English = like.