虽然 “beside” 和 “Besides” 在拼写上只差一个字母 “s”，但它们的意思和用法却完全不同。
1 “Beside” 是介词，表物理方位 “在…旁边”，相当于更正式一点的 “next to”。
Put the chair beside the table.
Come and sit beside me.
The cinema is beside the park.
2 “Besides” 作介词用时，意思为 “除了…之外，还/且”，类似于 “as well as”。
Besides knowing grammar well, you need to have a good vocabulary.
You should do something else besides studying.
Besides enjoying reading, she loves playing football.
3 “Besides” 作副词用时，意思为 “此外，况且”，通常用来添加更重要或更强烈的观点，相当于不那么正式的 “moreover”。
I'm going to practise now because I've got time and besides, I need to!
I want to go and lie down. Besides, I have a headache.
I don't want to drive now. Besides, it's really dark.
