为什么是to my disappointment而不是to my disappoint,不是应该接形容词吗?

是to my disappointed还是to my disappointment To our disappointment对还是To our disappoint对 i made a call to my parents yesterday .To my disappointment My sweet heart,I will try my best to never disappoint you ag but to my disappointment no one dared to try such a tough, l To my disappointment every possible means —— to prevent air To my disappointment,____ in the students in that school don 英语,You ___ in your homework by now,but to my disappointment, I go to my home.为什么这个句子可以加to?home是副词.介词不是要省略吗? she's sure to be successful.to be 后为什么是接形容词?而不是用名词success. 为什么说my dream is to be a worker 而不是my dream is being a worker 为什么要用send cards to my friends,而不是for my friends?