so that、even though、as if、ever since都是是什么意思啊 举个例句

so that:表是目的He studies very hard so that his father will be happy.他用功读书,为了让他爸爸高兴.even though：即使Even thoughit rains tomorrow,we will still go out.即使明天下雨了,我们还是会出去的.as ...