before doing sth还是do sth

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• had better do sth可以默认为一般过去式吗例如You had better take a map with you when travel so that you wouldn't get lost.
• 用be supposed to do sth句型造十个句子
• 请问一下有没有这个句型:don't be afraid to do sth如果有,那我再想问一下 为什么要有个be?希望能解释清楚一点~
• 关于 be to do sth的句型不确定这个句式是否符合语法,例如：their plan is to rob the bank等等等
• be used to do sth 的句型意为‘’被用来做某事‘’是吧.它的be的时态怎样变化.什么时候是一般现在时,什么时候才用一般过去时.最好列几个例子.
• 这个是我所学过的短语,肯定句decide to do sth ,否定句decide not do do sth We decided to do to see a moive this sunday.（改为否定句）We ( )( ) to do to see a moive this sunday.请说明原因,
• 今年广东英语的语法填空^-^其中有一句是She wished that he was as easy TO PLEASE as her motheras 后面为什么加to please 是因为easy to do这个固定搭配吗?有没有easy do sth 这种用法
• He found ___ very difficult to drive a car.A.him B.it is C.it D.thatHe found ___ very difficult to drive a car.A.him B.it is C.it D.that答案给的是C,但我想知道这里为什么不是用“it is + adj.+ to do sth.”句型呢?还有it在这里是不是做宾语从句的形式主语?
• I will spend the whole night_____in my room,preparing for the exam.I will spend the whole night ____ in my room,preparing for the exam.A.locked B.in locking C.lockingD.being locked这个题给的参考答案是A，我觉得D是不太好spend time in doing sth.但这个句型只能用在花时间做某事上其中某事与主语应为主动关系 而本句显然不是我花一晚上的时间锁我自己的意思 所以不能用这个句型 排除B 再来看 ing表进行而ed形式表状态 我被锁在房间里是一种状态所以排除C 选A 请问选A之后这个句子怎么分析结构呢？locked in my room在此句中做什么成分呢
• abandon用法abandon oneself to sth纵情于某事那abandon doing sth是放弃做某事,还是纵情于某事.
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• 甲、乙两数的比是3:4,乙、丙两数比是5:6,则甲、乙、丙三个数的比是（）