it seems as if 和it seems that的区别

it seems that 和 it seems as if的区别 it seems as if 和it seems that的区别 it seems that和it seems as if的区别? It seems that 和It seems as if区别 it seems that和it seems as if的区别是什么? it seems that 和 as if 有什么不同? 请问 It seems that 和 It seems It seems that 和 It seems as if中的是形式主语吧?真正的主语呢?逻辑主语呢?（请详细一点, It seems as if it----rain. It seems that/as if在什么时候可以省略 求It seems to 和there seems to的区别~ it seems certain that和it seems sure that都有吗,区别呢?