GRAMMAR TIP 1:
Possessive case of a noun (nouns with 's) is used with living things.
Example : Mohan' s cap, Ram's school, sister's right
Incorrect : This room's carpet must be changed.
Correct : The carpet of this room must be changed. (Room is a lifeless thing)
GRAMMAR TIP 2:
Sometimes 's is wrongly put in the place of preposition.
Incorrect : This author's book is not good. (Book possessed by this author)
Correct : The book of this author is not good. (Book written by this author)
GRAMMAR TIP 3:
Double possessives should not be used.
Incorrect : My mother's brother's daughter came.
Correct : The daughter of the brother of my mother came.
GRAMMAR TIP 4:
In the case of 'somebody else', 'everyone else ',' anybody else' etc., 's is put after else.
Incorrect : This is somebody's else job.
Correct : This is somebody else's job.
GRAMMAR TIP 5 :
When two nouns are joined by 'and' then 'apostrophe s' ('s) is added to both if we want to denote the possession of both & to last if we denote joint possession.
Incorrect : Suzy's and Juicy's father was present.
Correct : Suzy and Juicy's father was present.
GRAMMAR TIP 6 :
When we speak of two things of the same class, the word 'other' should not be left out.
Incorrect : Neither his brother nor any member of the family helped him.
Correct : Neither his brother nor any other member of the family helped him.
GRAMMAR TIP 7 :
Verb form I [ s, es]
He works hard.
is/am/are + verb form I + ing
He is working hard.
has/have + verb form III
He has worked hard.
Present Perfect Continuous
has/have + been + verb form I + ing
He has been working hard.
GRAMMAR TIP 8:
verb form II [ did + verb form I]
He worked hard.
was/were + verb form I + ing
He was working hard.
had + verb form III
He had worked hard.
Past Perfect Continuous
had + been + verb form I + ing
He had been working hard.
GRAMMAR TIP 9:
will/shall + verb form I
He will work hard.
will/shall + be + verb form I + ing
He will be working hard.
will/shall + have + verb form III
He will have worked hard for 20 years before he retires.
Future Perfect Continuous
will/shall + have + been + verb form I + ing
He will have been working hard for more than 8 hours.