important Rules of Conjunctions. Rule 1 :The co-relative conjunctions are used in pairs. 1.Not only - but also 2.Either - or 3.Neither - nor 4.Both - and 5.Though - yet 6.Whether - or Please see that the pair is properly used. *.They will either do the work else return the money.☓ *.They will either do the work or return the money.✔ *.Both kumar as well as Ravi must finish it.☓ *.Both kumar and Ravi must finish it.✔ *.Not only does he read but also writes.✔ *.Though he is rich but he is economical.☓ *.Though he is rich yet he is economical.✔ Rule 2 :After the adverbs "Hardly / Scarcely", the conjunction 'when or before' should be used. *.Hardly had he left the place than the Bomb exploded.☓ *.Hardly had he left the place when the Bomb exploded.✔ Rule 3 :After 'Rather / Other, the subordinating conjunction 'Than should be used. *.He has no other object but to get a handsome job.☓ *.He has no other object than to get a handsome job.✔ *.I would rather buy a scooter but not a cycle.☓ *.I would rather buy a scooter than a cycle.✔ Rule 4 :After the subordinating conjunction 'lest' the auxiliary 'should' is used. Lest - for fear that / If it is not so. *. Work hard lest you fail.☓ *.Work hard lest you should fail.✔ Rule 5 :The connecting word 'that' is used with the adjective phrase 'the same/the only/superlative adjectives/all *.This is the same book which I wanted.☓ *.This is the same book that I wanted.✔ Rule 6 :The conjunction 'or' is used with not / never. *.I have never spoken to him nor written to him.☓ *.I have never spoken to him or written to him.✔ Rule 7 :With the word 'such' the connective 'that' may be used. *.There was such a noise what we could not hear ourselves.☓ *.There was such a noise that we could not hear ourselves.✔ Rule 8 : > Until - Denotes Time > Unless - Denotes Condition *.You will not succeed until you work hard.☓ *.You will not succeed unless you work hard.✔ *.I want to stay here unless she speaks the truth.☓ *.I want to stay here until she speaks the truth.✔ *.You cannot do well until you prepare yourself.☓ *.You cannot do well unless you prepare yourself.✔ Rule 9 :After the connective 'because' the words ' so / therefore / as' are not used. *.Because he came late so he failed to see her.☓ *.Because he came late, he fail to see her.✔ Rule 10 :The adverb 'Not' should not be used with the connective 'Till/unless/lest/until' in that clause. *.Until he does not solve this problem, I will stay with him.☓ *.Until he solves this problem, I will stay with him.✔ *.Unless they do not work sincere, they will not succeed.☓ *.Unless they work sincerely, they will not succeed.✔ Rule 11 :When 'since' is used as a conjunction should be preceded by present perfect tense and followed by a verb in the past tense to denote point of time. *.Many things have happened since I have left the school.☓ *.Many things have happened since I left the school.✔ Rule 12 :With the conjunction 'if' 'then' should not be used. *.If you work for 8 hours a day, then you will get through the examination.☓ *.If you work for 8 hours a day, you will get through the examination.✔ Rule 13 :When two objects are joined by 'as well/besides/along with /together with / in addition to / except / including with, the verb agrees with the first subject in number. *.He as well as his students have gone there.☓ *.He as well as his students has gone there.✔