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(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?...'
PETS-2语法讲解(23)
'go on doing/to do go on to do 做了一件事后,接着做另一件事。go on doing 继续做原来做的事。 After he had finished his math,he went on to do his physics.做完数学后,他接着去做物理。 Go on doin...'
PETS-2语法讲解(13)
'used to/be used to used to + do:"过去常常"表示过去习惯性的动作或状态,但如今已不存在。Mother used not to be so forgetful.Scarf used to take a walk.(过去常常散步)be used to + doing:对……已感到...'