Using far with a phrase of definite distance.
Don’t Say: Mary lives two miles far from here.
Say: Mary lives two miles from here.
When we use a phrase of definite distance (like two miles) in a sentence, don’t use the word far. We can say : Mary lives two miles away.

Go to home used instead of go home.
Don’t Say: When school is over I go to home.
Say: When school is over I go home.
The expression I go to home is wrong. Say: I go home.

Although Though … yet used  instead  of although though.
Don’t Say: Although it’s raining, yet he’ll go.
 Say: Although it’s raining, he’ll go.
Although (though) is the conjunction introducing the subordinate clause, and a second one (yet or still) isn’t required.

From now and on used instead of from now on.
Don’t Say:  From now and on I’ll study hard.
  Say: From now on I’ll study hard.
The phrase from now and on is incorrect. Say, from now on.

And etc. used instead of etc.
Don’t Say: I, you, we, and etc. are pronouns.
Say: I, you, we, etc., are pronouns.
Etc. is the short form of etcetera, a Latin phrase meaning and other things. The combination and etc. is wrong because it would mean and other things.
Note: However, students are advised to avoid using etc. in an essay and to use phrases such as and other things, and so on instead.

So … so that instead of so … that.
Don’t Say: I’m so tired so that I can’t go.
Say: I’m so tired that I can’t go.
When so or such is completed by 3 clause of result, introduce the clause by that and not by so that.

 From where used instead of where.
Don’t Say: From where can I buy a good watch?
Say: Where can I buy a good watch?
Where means at what place, while from where denotes the point of origin From where do tourists come?

For to used instead of to.
Don’t Say:  I came here for to learn English.
Say: I came here to learn English.

 Consider as used instead of consider.
Don’t Say:  Robert considers me as his best friend.
Say: Robert considers me his best friend.
Don’t use as after the word consider. We Say: He regards me as his best friend or Robert considers me to be his best friend.

Begin from used instead of begin.
Don’t Say:  Exams begin from Thursday.
Say: Exams begin on Thursday.
A thing can begin only at a point of time. The word can’t be used to apply to the whole time during which a thing is being done.

Return back used instead of return.
Don’t Say:  She has returned back to school.
Say: She has returned to school.
Don’t use the word back with return, because return means to come back.

Misuse of adjectives that can’t be compared.
Don’t Say: My work is more perfect than his.
  Say: My work is superior to his.
Or: My work is better than his.
Certain adjectives can’t be compared: perfect, unique, preferable, supreme, right, correct, etc.

Using a double comparative.
Don’t Say:  He’s more stronger than John.
Say: He’s stronger than John.
Double comparatives are incorrect’ more stronger ought to be only stronger. However, we can say much stronger.

Wrong use of that in direct speech.
Don’t Say: She said that, ‘I’m sure to pass.’
Say: She said, ‘I’m sure to pass.’
We can’t use that in direct speech, i.e. when we repeat the words that some other person has spoken without any change.
Note: In indirect speech we Say: He said that he was sure to pass.

Wrong repetition of object with infinitive.
Don’t Say:  I bought  an English book to read it.
Say: I bought an English book to read.
Don’t repeat an object with an infinitive of purpose if the verb takes an object.

Wrong repetition of object.
Don’t Say: The doctor I know him very well.
Say: I know the doctor very well.
In the sentence given, the words doctor and him denote one and the same object Therefore, use either doctor or him, but not both in the same sentence. In general, we don’t put the object before the verb so the word order in. The doctor I know him very well is also wrong.

Wrong use of personal pronoun in a relative clause.
.Don’t Say: The book which I lost it was new.
Say: The book which I lost was new.
Don’t use a personal pronoun as well as a relative in the relative clause if they both refer to the same noun.
In the first sentence both which and it refer to book.

Wrong repetition of subject  after  a  non-finite verb phrase.
Don’t Say:  Karen  and Tom, having signed  the  register, they left  the  church.
Say: Karen and Tom, having signed the  register, left the church.

Wrong repetition of subject after an adjectival clause,
Don’t Say: David, who is a careless pupil, he lost his  book.
Say: David, who is a careless pupil, lost his book.

Wrong repetition of subject in a compound sentence.
Don’t Say:  I  went  to the  market and I bought fruit.
Say:  I went  to  the  market and  bought fruit.
In a compound sentence, express the same subject once only and don’t repeat it before each verb, unless the sentence is long and complicated.

Wrong repetition of
Don’t Say: My little brother he is  at school.
Say: My little brother is at school.
Never repeat the subject by using a pronoun after the noun. My little brother and he denote the same person. Therefore, use one or the other as subject, but not both.