+1
A subordinate clause usually begins with a subordinate conjunction, such as:
  • although
  • because
  • even though
  • despite
  • when
  • Please explain the use of ":" and comma before "such as"
+1

The writer is using a comma to tell the reader to pause for a moment to think about what has just been said.

The writer is using the colon to introduce a list.

Comments  

We can use 'such as' to introduce an example or examples of something we mention. We normally use a comma before 'such as' when we present a list of examples.

EXAMPLE

Mary loves many colors, such as:

Blue

Pink

Purple

We use the colon " : " before a list

Students: Are you brave enough to let our tutors analyse your pronunciation?
 Clive's reply was promoted to an answer.

Clive,

shouldn't there be a way for teachers to not repeat answers to allow for better use of our valuable volunteering time?