Observe means to find out information.请问这句话是什么结构?为什么要加to呢?

Observe means to find out information.请问这句话是什么结构?为什么要加to呢? observe sb to do/doing 区别 翻译due to the staff's failure to observe laws something means nothing to with the time goes by.the surplus collegelife's been came to countdown that entirely's been passive for me because it means that i never ever put on the school's uniform and can't observe any rules and rugulations of the schools,also can't listen any what it means to me! refer to means啥意思? what refer to sb means? coinprobably means to invent FIN是什么意思 fin.eof fin是什么意思 FIN 解释 FIN是什么 FIN怎么样 fin is observe sb means doing 和 means to do区别和用法是什么?