为什么是Half of his money (was found) in the "found and lost case"?而不是were found?

为什么是Half of his money (was found) in the found and lost case?而不是were found? He completed about half of his work. half an hour中的half词性为什么是名词? 什么是“half and half” half of + 不可数half of his homework _____ wrong用Is 还是Are If half of a number is 30,then three-quarters of that number is _______.为什么是45? I don't know the cause of his abrupt leave为什么是his而不是 him HIS EDUCATION ADDED UP ONLY HALF OF A YEAR BECAUSE OF HIS ILLNESS改错. Each soul has its own mone of vibration! Tom got both of his hands ____(burn) because of his silly action.答案为什么是burnt呢? The boy ate one half of the apple and leThe boy ate one half of the apple and left another half for his sister（改错） Has the boy run out of his money为什么是run?而不是ran 为什么是One of his feet is bigger than the other不是~than another the writer with his fans is talking photos in front of the hall .为什么是is? i will send you a photo of him 为什么是him 不应该是his吗 Half of the vegetables——mine A belong to B belongs to C is D are为什么是d,不是a since his healthis getting worse,i think it is the time that he ( )his habit of smoking.since his healthis getting worse,i think it is the time that he ( )his habit of smoking.got rid of.为什么是got? half of his books ----written in English A: are B: have 为什么不用have? 详细点