下面这句子怎么分析,什么句型,时态,用法I think it would have been beteer to put more time and energy into studying,looking back on it.
问题描述：
下面这句子怎么分析,什么句型,时态,用法
I think it would have been beteer to put more time and energy into studying,looking back on it.
答
I think后面是一个宾语从句省略了that
后面的it一直到逗号为止又是一个it作形式主语真正的主语为to后面的句子
而逗号后面的就是伴随状语了
答
I think （that）.... 后面是宾语从句。
looking back on it，是现在分词短语，伴随状语。
to put more time and energy into studying （ would have been better），it 是从句里面形式主语。 这里是虚拟语气。
答
looking back on it是整个句子的状语.宾语从句是用IT做形式主语,真正主语是 to put more time and energy into studying,估计你是would have been better 不明白,这里是一种虚拟,表示对过去事实的一种惋惜.