第1个回答 2010-07-21
I 是主语,think是谓语,it 是宾语,也就是形式宾语,important 是宾补,
to learn English well是不定式做真正的宾语。这样的成分就完整了。
I always think it important to learn English well.
=I always think it important that I should learn English well.
如果前面没有I always think , it is important to learn English well就是一个完整的句子。因为find,think,feel,make,believe,consider的词为避免头重脚轻用it做形式宾语本回答被提问者采纳