2020湖南普通专升本：如何正确学习原因状语从句

原因状语从句：连接词：because,since,as,for，now that,in that,owing to,due to,thanks to,because of,as a result of;
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。I didn't go,because I was afraid；当原因是显而易见的或已为人们所知，就用as或since。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。He is absent today,because/for he is ill（As/since he is ill,he is absent today）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 must be ill,for he is absent today.
如何正确学习原因状语从句
(3)now that：既然；Now that this semester is finished,I am going to rest a few days and take a trip
(4)in that:因为，通常只能放在句中，强调重要的，唯一的原因；Human beings are different from animals in that human can speak and think.
(5)owing to,due to,thanks to,because of,as a result of等短语后面只能接词或短语，不能接从句；
Owing to his rich experience,his salary was very high由于他经验丰富，他的工资很高
Owing to unfavorable weather we were unable to proceed由于天气不好，我们不能继续前进
This is partly due to demand这部分是由于需求增大所致
This could be due to inflation这个可能归因于通货膨胀
This year firms have cut their hiring due to the economic crisis今年由于金融危机的影响，公司纷纷减少雇佣人
Thanks to the expansion of successful firms and the entry of new ones,however,many more jobs were created than destroyed可是由于那些成功企业的扩张以及新企业的进入，创造的工作机会多出了被摧毁的工作机会
Human differ from animals because of their ability to speak and use tools人类和其他动物不同，在于他会说话和会使用工具