It is important to learn English.是主语从句吗?

It is important to learn English.是主语从句吗? it is important to learn English It is important ______us to learn English. It is important to us (learn)English how important it is to learn English. It is important for us to learn English well. 为什么用to learn是用 It is important for you to learn to speak English why is it so important to learn English 作文 It is important to learn English.的句子结构分析 I find that it is useful to learn English.it是形式主语, 句子it is important to learn english,为什么这么安排,而不是learn english I think it hdrd to learn English.哪个是主语?