Example: He bought the car even though it was expensive
Take a look at the chart below to study the various usages of adverb clauses showing opposition
Punctuation
When an adverb clause begins the sentence use a comma to separate the two clauses
Example: Even though the it was expensive, he bought the car
When the adverb clause finishes the sentence there is no need for a comma
Example: He bought the car even though it was expensive
Adverb Clauses Showing Opposition
Even though, though, although
Even though it was expensive, he bought the car
Though he loves doughnuts, he has given them up for his diet
Although he course was difficult, he passed with the highest marks
Notice how 'though, even though' or 'although' show a situation which is contrary to the main clause to express opposition
Even though, though and although are all synonyms
Whereas, whileWhereas you have lots of time to do your homework, I have very little time indeed
Mary is rich, while I am poor
'Whereas' and 'while' show clauses in direct opposition to each other
Notice that you should always use a comma with 'whereas' and 'while'
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