The verb "is" is singular and the verb "are" is plural. Compound subjects and objects, joined by and use "are". Those joined by or use the singular "is".Examples:Tom and Bill are going.Either Tom or...
Use it's (with the apostrophe) only when you mean "it is" or "it has." For example: It's time to go. (It is time to go.)It's been a long time. (It has been a long time.) Use its (without the...