1. Open: 24hrs

Try,
Open 24hrs, without the colon ( : ).
2. Opened: 24hrs

Try, Was opened 24hrs ago.
3. Opens: 24hrs

Try, Opens in 24hrs.
3. Sunday: Closed
4. Sunday: Close

I see this sign a lot in Japan. What happened to the "-d"?? :lol:
Also, sometimes I see switches that say 'open' and 'close', what does it mean? Why doesn't it say 'opened' and 'closed' How do you know which one to use?
Actually, the switch should read: on (i.e., switch on) and off (i.e., switch off). 'open' and 'close' are direct semantic borrowings. For example, they are words I used to use when I lived in a French speaking community. French uses the concepts, open the light, close the light.
Sometimes I see these signs
when I'm at
a resturant, but I don't know if
they are right or wrong. How do you know?
7. How was the
run?
8. How was the
ran?

('was' is already carrying the tense; change 'ran' to 'run').
9. The
run was okay.
10. The
ran was okay.

(See 8.)
11. I don't know what the negative comments
were all about.
12. I don't know what the negative comments
are all about.
13. I don't know what the negative comments
were all about.

14. I don't know what the negative comments in
the other reviews were all about.
15.
Commission people can make a lot of money.
16.
Commissioned people can make a lot of money.
'commissioned' describes 'people'.