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 if：好像
He left without a word as if he WILL never return.
他一句话也没说就走了,好像再也不回来了.
ever since：从那时到现在
ever since you left me,i've been try to hide the pain.自从你离开了我 我一直在掩饰内心的伤痛