Hello,
1. I must obey my parents. (rewrite in negative form without change in meaning)
1A. I cannot help but obey my parents.
1B. I cannot help obeying my parents.
2. Every problem has a solution.(rewrite in negative form without change in meaning)
2A. There is no problem which has no solution
2B. There is no problem which does not have a solution.
Are these correct?
Which one better between '2A' and '2B'?
Thanks.
1A and 1B are fine. You could also say "I must not disobey my parents". 2A and 2B are not wtong.
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1A and 1B are fine.
You could also say "I must not disobey my parents".
2A and 2B are not wtong. 2B sounds better to me.