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英语从属连词一定引导句子吗?

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英语从属连词一定引导句子吗?
从属连词一定引导句子吗,见过连接单个名词和介短的用法.
对于从属连词用法一般定义为引导从句,当上述情况是否为省略某种成分的用法.
请教高手!
建议不要细抠所谓的规则,否则容易机械化!英语也是语言,宜活学活用,积累重要语言点(一些实实在在的例句,而不是所谓的“规则”),培养语感.
以下供参考!
从结构上说,英语连接词分两大类:并列连词(coordinating conjunctions)和从属连词(subordinating conjunctions).并列连词连接两个或两个以上地位平等的字、词组或分句.例如:(1) Air and water are indispensable to me.(2) She likes going out with friends or playing outdoor games.(3) Most workers have a good income,so they look very happy.从属连词连接两个或两个以上的分句,形成复杂句中的从属分句.例如:(4) He said that he did not want to go .(5) Many things have happened since I last saw him.(6) You may come if you want to.从属连词用来连接各种从句.until(till)直到,在用until表达时间状语的句子中,主句中的动词是要十分小心去选择的.如动词是持续行动词,它要用肯定句,如:I studied hard until 12 o'clock last night.如果动词是瞬间截止性动词,则要用否定句,如:He didn't go to bed until his mother came back.由since,for,by,before,来引导的时间状语从句.since 引导的时间状语是动作的开始时间,如:I have studied English since 1990.而by引导的时间状语通常是动作的结束时间,如:I had learned 25 English songs by the end of last term.