The prom was very attractive. The boy standing over there is my classmate. My belief is that he’s got a health problem.

表语从句：在句子中作表语，一般放在系动词后面，常用结构是 主语＋系动词 ＋表语从句。 常见的连系动词有：be, look, remain, become, turn, get, go, seem, feel, smell, taste, …

Grammar 1 – 1.Observation (2m) Take a look at these sentences.