The easy way to ielts writing academic Module

“Defining relative clauses,”
which provide essential information about
the noun they refer to, and they cannot be omitted from the sentence as
they are a part of it. As a punctuation rule, there are 
no 
“
commas
”
before and after defining relative clauses. These clauses are not
extensively used in writing diagrams and flowcharts as they mainly help
with concise writing, which may better fit writing task 2. In this type of
writing, we may need to extend sentences to meet the word limit
requirement.
For example
The pen which is on the table is mine. (The relative clause provides
essential information separating “the pen” from other pens.)
The tree that is in the middle of the garden does not grow well. (The
relative clause gives essential information about “the tree” to be
recognized in the garden among other trees.)