6). 常用句型
①. can not/ can never… too…
cannot … enough
e.g. One cannot be too careful.
②. cannot help doing…
cannot help but do…
③can not help do...
不得不做某事/ 只有做某事
do everything/all/what sb. can/could to do sth.
不论怎么…也不为过;越…越好
情不自禁做某事
不能帮忙做某事
某人尽最大努力做某事