Round (= on  all  sides  of).
Don’t  say: The  earth  goes  round  of  the  sun.
Say: The  earth  goes  round  the  sun.
Note: Around is similar in meaning and use to round.

Outside (=  on  the exterior of).
Don’t  say: They  stood  outside  of  the  door.
Say:   They  stood  outside  the  door.

Inside (=  in the interior of).
Don’t  say: The  boys  went  inside  of  the  room.
Say: The  boys  went  inside  the  room.

Behind (=  at  the  back  of).
Don’t  Say:   Edward  hid  behind  of  a  large  tree.
Say:  Edward  hid  behind  a  large  tree.

 Tell (= say to).
Don’t say:  I  told  to  him  to  come  at  once.
Say:  I  told  him  to  come  at  once.

 Resemble (= be similar to).
Don’t say:  Does  she  resemble  to  her  father?
Say:  Does  she  resemble  her  father?
Note: resemblance takes to or between. She bears no resemblance to her father, There is no resemblance between them.

Reach (= arrive at).
Don’t say:  We  reached  at  the  school  early.
 Say:  We  reached  the  school  early.

Allow (to) or let  (=  give permission to).
Don’t say:  The  driver  allowed let  to  John  (to)  sit  in  the front   seat.
  Say:  The  driver  allowed let John  (to)  sit  in  the  front seat.
Note: Permit has a similar meaning to let, though it’s used in more formal situations The teacher doesn’t permit us to talk in class.

Obey (= act according to).
Don’t  say: We  should  obey  to  our  teachers.
Say: We  should  obey  our  teachers.

Leave (= depart from).
Don’t  Say:   Brian  left  from  England  last  week.
Say:  Brian  left  England  last  week.

 Finish (=  come to the end  of).
Don’t  Say:   I’ve  finished  from  my  work.
Say:   I’ve  finished  my  work.

 Enter (= go into).
Don’t  say: We  entered  into  the  classroom.
Say: We  entered  the  classroom.
Note: We enter into a conversation, a debate, or a discussion.

Comprise (= consist of).
Don’t say: The  book comprises  of five  chapters.
Say: The  book  comprises  five  chapters.
Or: The book is comprised of five chapters.

Attack (= go and fight against).
Don’t say:  They attacked  against the enemy.
Say:  They attacked the enemy.
Note:  We say, to make an attack on: They made an attack on the enemy.

Ask (= put a question to).
Don’t say: I asked to the teacher about it.
 Say:  I  asked  the  teacher  about  it.

Approach (= come near to).
Don’t say:  Don’t  approach  to  that house.
Say: Don’t approach that house.

Answer (= reply to).
Don’t say:  Please  answer to  my question.
Say:   Please answer my question.
Note:  The noun answer takes to. His answer to my question was wrong.

Thank you used instead of No, thank you.
Don’t say: Thank  you  (if you want to  refuse  an  offer).
Say:   No, thank you.
Note: Use thank you to accept an offer. It generally means Yes, please.