we must pay attention to protecting our environment.这里的"protect"为什么要用ing形式?还有一题：In the past,she always controled her weight.这里的"protect"为什么用过去式,前面不是有一个"always"吗?

we must pay more attention to our health. We+must+pay+attention+to+the后面填什么 The cold weather,we must pay attention to warm oh! 分析句子成分 When we cross the street,we must pay attention to the light. 分析句子成分,When we cross the street,we must pay attention to the light. we must pay attention to the _____(safe)when we take the plane 分析句子成分When wei cross the street, we must pay attention to the light. 改为被动语态：we must pay attention to our pronunciation to speak English well.用两种方式 Is the environment the price we must pay for the economic development we must pay a___to our pronunciation空格处填一个单词!practice可以么? We must pay attention in the traffic lights.哪个单词错了? what counts is how much work me must do to pay for what we buy We must pay attention ___the way we stand and sit.A.on B.in C.to D./ She said that we （must）pay attention to our manners.为什么用must?A.CAN B.MAY C.MUST D.HAD TO We must we must ____ enough time ___ english.A.spend,reading B.pay,for C.cost,in D take,with now you pay what we pay Passage 1We know that we have to pay for what we get.If we buy food,we have to pay for it.If a doctor treats us,we know there will be a bill to pay.These are private bills.But there are public bills that must be paid.Public bills are paid for by the