► ifused to introduce a phrase when something else depends on that action and situation: We’ll have to leave Monday if it snows today. If you wash my car, I’ll give you $10.
► as/so long as used when saying that something is true only if someone does something or if something happens: Hiking in the mountains is safe as long as you follow some basic rules.
► provided/providing (that) provided that and providing that mean the same as as long as but are more formal: All students can participate provided that they have their own equipment.
► on condition that used when saying that something is true only if someone agrees to do something: They offered him the job on condition that he moved to Chicago.
► unless used when saying what will be true if someone does not do something or if something does not happen: You won’t pass your final exams unless you study hard.
► in case used for saying what might happen, which someone wants to be prepared for: She did not think it would rain, but she took her umbrella just in case it did.
► even if used when saying that something will still be true despite another action or situation: Even if we leave now, we’ll still be late.
► whether or not used when saying that it does not matter if something happens or not, or if something is true or not: Her comments are always interesting, whether or not you agree with what she says.
► or used for saying what the bad result will be if someone does not do something or if something does not happen: Stop that or I’ll tell Mom.
► otherwise otherwise means the same as or but is more formal and is used to start a separate sentence: He had better hurry up. Otherwise, we’ll be late.