as the weather was fine i opened all the windowsas

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I opened all the windows because of the fine weather because of + 名词.代词
I opened all the windows because the weather was fine. because 接从句,语意强于as
I opened all the windows, for the weather was fine for 是并列连词,只能置于两个句子之间
而 because , as 从句还可以置于句首
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======以下答案可供参考======
供参考答案1:
原因状语从句
　　一、引导原因状语从句的从属连词
　　主要的有because, as, since,for，seeing (that), now (that), considering (that)，in that等：
　　The woolly shrank because it was washed badly. 毛衣因洗得不得法而缩水。
　　I can’t get to sleep because of the noise outside. 由于外面声音嘈杂我睡不着。
　　Since [As] we’ve no money, we can’t buy it. 由于我们没钱，我们无法购买它。
　　Seeing that it’s raining, we’d better stay indoors. 既然外边在下雨，我们最好待在室内。
　　Now that you are here, you’d better stay. 你既然来了，最好还是留下吧(既来之，则安之)。
　　【注】除以上提到的大家比较熟悉的引导原因状语从句的从属连词外，when有时也可引导原因状语从句(when表示“既然”)
　　I won’t tell you when you won’t listen. 既然你不想听，我就不告诉你了。
　　二、关于not…because结构
　　该结构中的否定词有时否定主句，有时否定从句，一般要根据句子的意思作出正确或合乎逻辑的理解。若not否定主句，最好在because之前用逗号，否则会引起歧义，如下句在没有特定上下文时就有两种解释：
　　I didn’t go because I was afraid. 我没有去是因为怕。/ 我不是因为怕才去。
　　不过若because之前有just修饰，一般认为not 是否定从句的：
　　You shouldn’t get angry just because some people speak ill of you. 你不要因为有人说你坏话而生气。
　　三、because习惯上不与so连用
　　汉语习惯上说“因为…所以…”，但英语习惯上却不能将 so与because 连用：
　　因为下雨，所以我们呆在家里。
　　正：Because it was raining, we stayed at home. / It was raining, so we stayed at home.
　　误：Because it was raining, so we stayed at home.
　　四、because 从句与 because of短语的转换
　　Because引导的原因状语从句有时可与because of 短语转换：
　　He can’t e because he is ill. / He can’t e because of his illness. 他因病不能来。
　　I said nothing about it because his wife was there. / I said nothing about it because of his wife’s being there. 因为他妻子在那儿，我对此事只字未提。
　　比较：because, since, as和for
　　1）　because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。
　　I didn't go, because I was afraid.　　Since /As the weather is so bad, we have to delay our journey.　　2）　由because引导的从句如果放在句末，且前面有逗 号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。　　He is absent today, because / for he is ill.　　He must be ill, for he is absent today.