PETS－2语法讲解(32)
'不定式的特殊句型too…to… 1）too…to 太…以至于…He is too excited to speak.他太激动了，说不出话来。---- Can I help you ? 需要我帮忙吗?---- Well, I'm afraid the box is too heavy for you to carr...'
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...'
PETS－2语法讲解(27)
'begin(start) doing/to do begin/start to do sthbegin/start doing sth. 1)谈及一项长期活动或开始一种习惯时，使用doing.How old were you when you first started playing the piano?你几岁时开始弹钢琴？...'
