你好. 记住这个结构:
1 can't - - - - too- - -
can never-- - - too----
解释为:再怎麼- - - 也不过分.
You can't work too hard.--------你再怎麼努力学习也不过分.
2 shouldn't / mustn't - - - - too -- --.
解释为:不可以 / 不应该 -- -- -太- - -
You shouldn't / mustn't work too hard.------你不应该太劳累 / 太辛苦.