Prefix IL= IM=In= Ir= dis= mis=un

1. Stealing someone's pen is Illegal.
2. What you are doing is Incorrect.
3. You are irresponsible.
4. You may be dismissed  and sent out of the school.
5. This is your misbehaviour.
6. You can undo this and ask  for excuse .
7. Your behaviour must not displease anyone.
8. Not knowing a word is not a disadvantage. It is time you start learning.
9. Being poor is not a misfortune. You can become fortunate if you really try.
10. You need not be unhappy,because you are poor.
11. You may be unknown now. If you try hard with patience and perseverance you will be on the top of the world.
12. It is uncommon to be  the richest man on earth.
13. If you are unable to do a sum first,learn from your friend  or your teacher.
14. Your inability to do this sum is not your disadvantage.
15. You should not be indifferent in learning maths. 
16. If you fail to get good marks,don't be disappointed.
17. Learn the subject thoroughly and get good marks next time.
18. Don't be discontented.Try,try ,try again, again and again until you gain.
19. The sun is visible in the daytime. But invisible in the night time.
20. Can you say the Sun is not there????
21. You must disconnect the wire, if you want to put off the fan.
22. Don't be Impolite and rude with the under-privileged persons.
23. It is uncertain whether the weather in Ooty is pleasant now.
24. You are not unfortunate or unlucky.You can be very fortunate and very lucky.This is in your hands only.
25. What you give me is insufficient.Please give me some more so that I will not be hungry.
26. You must not be disorganised in your daily chores.Organise,plan and do the job.You will be happy.
27. You must not be irregular in your studies. Start maintaining a timetable for all your work on a day to day hour to hour basis.
28. Be not unkind to the animals.
29. Learning for knowledge must be insatiable. You cannot be a master of everything in this world.
30. It is just like drinking all the sea-water at one time.
31. It is unfair to travel in the bus without paying the fare,even though you are fair and you are going to the Fair.
32. Remove all the unnecessary things from your table and keep only the book which you want to read or study now.
33. Our trip to Kodaikanal was disapproved by our principal.
34. The world is flat was disproved and it has been proved that it is round in shape.
35. You must not be ungrateful,if you receive any help or assistance.
36. Dog is more faithful and loyal but man is disloyal and unfaithful.
37. Wasting time on gossipping is Unimportant.
38. You must discontinue your wasting time from now on ,for you will not get one more chance to make the best of time and the opportunity.
39. The ancient generation lived in Unsheltered quarters and they were wet in the rain and they were warmed by the hot sun.
40. You must not be insincere to yourself and to others .if you want success.
41. You cannot disregard all that is said here.
42. It is unjust to punish an innocent person.
43. You must not be disobedient to your teachers.
44. Unsophisticated and inexperienced person will take more time to complete a job.
45. Loading and unloading is done in every port.
46. You can sometimes get Unexpected people as guests.
47. You can be punished for your indiscipline.
48. You will be ineligible for the job,if you are not qualified or not experienced.
49. This machine is unfit for this particular job.
50. We see many unemployed people in India.
51. Teachers will not give marks if your answers are incorrect even if you give them Cadbury chocolates.
52. Mount Everest is not inaccessible for the really trying person.
53. Reading  the books in the library is unrestricted.
54. Your discordant and incongruous relations may put you in problems.
55. It is unconventional to marry by registration in India.
56.