The answer lies in the apostrophe.
“Your” is the possessive, as in “Your smile makes me happy, but your dog’s smile is just a showing of teeth.”
“You’re” is an abbreviation. It is the shortened version of “you are”. So I could write “You’re an amazing person, & you’re still noted for your happy smile, but your dog is still teeth on legs.” meaning “You are an amazing person, & you are still noted for your happy smile, but your dog is still teeth on legs.”
“were” & “we’re” follow the same rules.
“were” is the past tense of plural “to be”
“we’re” is an abbreviation of “we are”
So in a sentence: “We were at the cinema the other night. It was so good, that we’re going again with our children. They like the idea & they are eager to join us. We’re that sort of family.”
Without the abbreviations:
“We were at the cinema the other night. It was so good, that we are going again with our children. They like the idea so much & they are eager to join us. We are that sort of family.”
Their & There & They're are also similar
“Their” is the plural possessive (owned by more than one)
“There” is a pretty difficult word to explain because it has multiple functions. In verbal & written English, the word can be used as an adverb, a pronoun, a noun, an interjection, or an adjective.
“They’re” is much simpler. It’s an abbreviation: “they’re is an abbreviation of “they are”
Enough to say that “there” can be used as a direction... “Go there” “There is the tree” “Over there” “There were many people”. The word is used here within those groups, but it is better to say what it is NOT.
“there” is not “their”, neither is it “they’re”.
I ran out of space so...
This story involves a couple of young people named Bert & Elsie
I’ve put brackets after each one to try to explain its function.:
They’re (They are - or Bert & Elsie are) going to see their (Bert & Elsie’s) parents at Christmas time. There (Adverb) will be presents from their (Bert & Elsie’s) mother & I assume that their (Bert & Elsie’s) father will contribute. Auntie Alice & Uncle Joe with be there (at the venue) with their (belonging to Auntie Alice & Uncle Joe) ghastly offspring, but Mad Maudie’s keepers send their (Mad Maudie’s keepers’ - or the love of Mad Maudie’s keepers) love; explaining that they’re (they are) unable to be there (be in a certain place “there” noun) also; they’re too busy with their (Mad Maudie’s keepers) own celebrations & their (Mad Maudie’s keepers) time is too restricted.