D. Unless = except if (e.g. The club is for members only. You can't go in unless you are a member (=except if you are a member))
a. Instead of unless it is often possible to say if ~ not (e.g. Unless we leave now, we'll be late.)
D1. As long as or So long as / Provided (that) or Providing (that) = if or on condition that (e.g. You can borrow my car as long as you promise not to drive too fast. Travelling by car is convenient provided (that) you have somewhere to park.)
a. When you are talking about the future, do not use will after unless/ as long as/ so long as/ provided/ providing. Use a present tense. (e.g. I'm not going out unless it stops raining. (not unless it will stop)
Idiom 365
Variety is the Spice of Life: more experiences or doing many different things
Example: My son is learning to play golf after he finished studying because variety is the spice of life.