1．It is+形容词+for sb. to do sth. “某人做某事是……” 如：
It is very easy for me to work out the chemistry problem. 解出这道化学题对我来说很容易。
It is important for us to master a foreign language. 我们掌握一门外语是很重要的。
也有这样的句型： It is /was+形容词+不定式 “做某事是……”
如：It is wonderful to travel in that great forest. 在那片大森林里旅行，真是太美了。
