Question 7: Use 'UNLESS' instead of 'IF'
If you do not like this one, I’ll bring you another.
Unless you like this one, I won’t bring you another.
If she does not hurry, she’ll be late.
Unless she hurries, she’ll be late.
If you are not careful, you’ll cut yourself.
Unless you are careful, you’ll cut yourself.
If you had not sneezed, he wouldn’t have known that we were there.
Unless you had sneezed, he wouldn’t have known that we were there.
Question 8: Correct the underlined parts
If Lucia had been here now, she would find out the truth about her uncle’s accident.
Change "here now" to "here"
Corrected: If Lucia had been here, she would find out the truth about her uncle’s accident.
If a student takes a course on Computer Science, it will take him four years doing the course.
Change "doing the course" to "to do the course"
Corrected: If a student takes a course on Computer Science, it will take him four years to do the course.
Unless it did not rain, Peter would pay us a visit.
Change "Unless it did not rain" to "If it did not rain"
Corrected: If it did not rain, Peter would pay us a visit.
If I had knew the time when the match started, I would have told you.
Change "knew" to "known"
Corrected: If I had known the time when the match started, I would have told you.
If she had finished the work, she can go home.
Change "can" to "could"
Corrected: If she had finished the work, she could go home.
If I had spoken more confident at the interview, they would have offered me the job.
Change "confident" to "confidently"
Corrected: If I had spoken more confidently at the interview, they would have offered me the job.
If we had had a map, we would not be lost yesterday.
The sentence is correct.