Incorrect omission of prepositions

Omission of the pronoun subject from the principal clause.

Rule: When the sentence begins with an adverbial clause, use the personal pronoun as the subject of the main clause.

Incorrect Usage: When he saw the ghost, was terrified.

                                           

Correct Usage: When he saw the ghost, he was terrified.

Use of the wrong Grammar

Using who? or what? instead of which.

Don’t say: Who of the two boys is the taller?

ü Say: Which of the two boys is the taller?

Using the interrogative pronoun which? for both people and things, asks for one out of a definite number.

Use of the wrong Grammar

Using the relative pronoun which for persons.

Don’t say: I’ve a brother which is at school.

ü Say: I’ve a brother who is at school.

Only use which as a relative pronoun for animals or things. The right pronoun to use for people is who (whose, whom).

Use of the wrong Grammar

Using an object pronoun in a double genitive.

Don’t say: A friend of him told us the news.

ü Say: A friend of his told us the news.

We use the double genitive when we want to emphasize the person who possesses rather than the thing which he possesses. A friend of his is simply another way of saying one his friends.

Use of the wrong Grammar

Using the subject pronoun after between.

Don’t say: It’s a secret between you and I.

ü Say: It’s a secret between you and me.

Between is a preposition, and all prepositions take the objective case after them.