One / Some
A: Do you have a bike I can borrow?
B: Yeah, I have one, but it’s very old.
A: Does it run well?
B: Yeah, it works, but it might need a new tire.
A: You know, I think I have one in the garage.
B: Perfect. Then you are all set.
A: Would you like a cookie?
B: I would love one!
A: Did you make them yourself?
B: No, I bought them at the store.
A: They look delicious.
B: Oh, I hope you enjoy them.
A: Do you have a pen I can use?
B: Yes, you can use this one.
A: Thanks, I will give it right back.
B: That’s OK.. You can keep it.
A: Oh, I just need it for a bit.
B: Really, keep it. I never use that one anyway.
A: Do you have any paper clips?
B: There are some at my desk.
A: I’m sorry. I don’t see them.
B: Oh, they are in the drawer.
A: This one? The top one?
B: No, the next one. That one!
A: OK, found them. Thanks.
Rule: We often use ‘one’ and ‘some’ as object pronouns the first time we refer to something, then switch to ‘it’ and ‘they/them’ after that.
A > One > It
(Q) Do you have an umbrella?
(A) Yes, I have one. It is over there. Take it if you like.
(Q) Do you have a car?
(A) Yes, I bought one last month. It is old though. I only drive it on weekends.
-S > Some > They > Them
(Q) Do you have any chairs?
(A) Yes, there are some outside. They are on the deck. You can bring them inside.