Q: If i don't know that that's a good one, can we say that "That's an awful one"?

A: no

Q: If It may take a little time., can we say that "It will be done quickly."?

A: no

Q: If Again, family members say they had no idea she was pregnant., can we say that "She didn't want them to know that the father was a married man."?

A: it is not possible to tell

Q: If Good luck today, my friend., can we say that "I hope you fail."?

A:
no