第一组：

1) The exercises are so simple that almost anyone can do them.

2) The exercises are so simple that almost everyone can do them.

第二组：

1) The exercises are so simple that almost any one of them can do them.

2) The exercises are so simple that almost every one of them can do them.

第三组：

1) Although Mr Smith wasn't present, anyone else was there.

2) Although Mr Smith wasn't present, everyone else was there.

请教一下各位老师，上述三组句子是否全部正确？如果正确，那么在选用方面，句中anyone和everyone，any one of them和every one of them，anyone else和everyone else之间是否存在细微差异？如果存在，细微差异是什么？

十分感谢。