What's "as long as" mean, and when can I use it?

Native speaker’s answer
Rebecca
There're a couple of meanings for "as long as!" The one here means "provided that," implying that one thing will only happen if something else happens. It can also mean during the whole time of something else. Ex: I'll go on the school trip as long as you come too. Ex: As long as you water the plants, they'll stay alive.