这个东西,你还要给出一些情景。有时候会有区别,有时候没什么区别。come 是说 motion towards a place.come along 是 to join a group of people比如说 party, you wanna come (over)? come along? 并没什么区别my work place, you wanna come along? kinda weird.
你好!hand up 是个固定短语,意思是举手,相当于put up one's hand, 这里的hands up, 不是第三人称单数加s,而是名词复数,口语中常用hands up,all those(所有的人)是先行词,who引导定语从句。全句意思是: 所有认为是Adnan做这件事的人请举手。也可以说: Put up your hands all those who think Adnan did it.