Rule 1: The conjunction so/as and as/ as is used to make a comparison. But, so/as is used in negative sentences whereas as/as can be used for both negative and affirmative sentences.

Rule 2: The conjunction both is always followed by the conjunction and.

Rule 3: Lest is a negative word and is always followed either by should or first form of the verb. e.g.,

► Dance carefully lest she should fall.
► Dance carefully lests he falls.

Rule 4: Rule of comma

► Always use a comma before the coordinating conjunctions when it is used to connect two independent clauses e.g. Bleh walked his dog, and he grabbed the mail.
► The conjunction though/although is always followed by a comma(,) or yet. e.g.

Though she put a lot of effort, she didn’t crack the exam.
Though she put a lot of effort yet she didn’t crack the exam.

Rule 5: Unless & Until - Unless is action oriented. Until is time oriented

► She will not succeed unless she works hard for the exams.
► The father asked his son to wait until he returned.

Rule 6: The correlative conjunctions to be followed in their definite pairs ‘not only – but also’ , ‘no sooner – than’ , ‘Hardly – when’. e.g.

► Not only she but also he planned for a movie
► No sooner did he arrive than they came back.
► Hardly had I finished my lunch when my friends came.

Rule 7: The conjunction doubt/doubtful is followed by that in negative or interrogative sentences whereas in affirmative sentences these are followed by if or whether. e.g.

► She is doubtful whether she will attend the party.
► I don’t doubt that he is hardworking.

Rule 8: The conjunction From is followed by to and Between is followed by and. e.g.

► It is difficult to choose between gold and silver.
► He keeps on singing from morning to evening.

Rule 9: When more than two persons or things are involved, then (none of/one of) is used instead of (neither/either). e.g.

► One of the employees complained about the manager.
► None of the family members complained about the theft.

Rule 10: The conjunction Rather/Other is followed by than e.g.

► She would rather give away her car than a necklace.
► We have no other option than to go back home.