First,don't look upon the study of grammar as all or nearly all that you have to do in learning to write correctly.Important as it is,grammar is not everything.
Secondly,don't indulge in much reasoning from the definitions；that would be sheer waste of time and energy.
Thirdly,don't be a slave to grammatical terms，about which uniformity does not prevail。
Fourthly，don't draw hasty conclusions from one or two examples.
Fifthly，don't cling to any narrowly grammatical point of vie at the expense of idiom.There are many idiomatic constructions that do not admit of grammatical analysis.
Sixthly,don't treat the study or grammar merely as something curious or fascinating,though you may delight in the philosophy or science of the language.
Seventhly,don't content yourself with knowing the rules of grammar.To know a rule is one thing;to keep it is another.引自 【CHARPTER 5-WRITING CORRECTLY（CONTINUED)】
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