Object...

果兩個 object 分別叫 direct object 和 indirect object.

Direct object:
I like you.
I eat you.
I kick you.
動詞後面不需加 to, at, on 等的 object 就是 direct object. 例如 I sit on you、I look at you 個 you 就不是 direct object.

Indirect object:
I .... to you.
I .... for you.
To 或 for 後面那個是 indirect object. 例如以下句子中的 Mary：
I sent a letter to Mary.
I bought a book for Mary.

但有時句中並不寫明個 to 或個 for 字的，但 Mary 仍是 indirect object：
I sent Mary a letter.
I bought Mary a book.

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呢個係睇個 verb 本身既意思
一般字只需一個object, 多一個都冇用:

I love you
He saw me
I hate them

但有些字要有兩個object, 意思先完整:
I will buy you a book. (如講 I will buy you, 你會問 "你買咩俾我?")
Let me give you something (如果 let me give you, 你會問 "你俾咩我?")