PETS-2语法讲解(33)
'不定式的特殊句型so as to 1) 表示目的;它的否定式是so as not to do。Tom kept quiet about the accident so as not to lose his job.汤姆对事故保持沉默是为了不丢掉他的工作。Go in quietly so as not to...'
PETS-2语法讲解(29)
'一般现在时的用法 1) 经常性或习惯性的动作,常与表示频腮度的时间状语连用。时间状语:every…, sometimes, at…, on SundayI leave home for school at 7 every morning. 2) 客观真理,客观存在,科学事实...'