英语初学者~~~

<>内表示主语；谓语{}；宾语[]；()内是我解释的话
often {see} [that man] in the street.
我经常在街上看到那个男的。
(这句话你好像忘记打上主语了，根据中文猜测应该是I)
<he> {has} a very happy [family].
他有一个非常幸福的家庭。
(这句话的主语应该是大写的He。）
<A man> {is sitting} on the desk.
一个男的正坐在桌子上。
(这句话没有宾语。sit 作为不及物动词，后面不加宾语)
<You> {see} [the green leaves] on the tree.
你在树上可以看见绿叶。
(你也可以把leaves看做宾语green看做修饰leaves的修饰语)
<Tim> {ran} back to get the black hat and the red bag.
蒂姆跑回去拿到了黑色的帽子和红色的包。
<Nothing> to fear but fear itself.
除了恐惧本身之外没有什么可恐惧的。

often see that man in the street.
主语省略了，谓语是see，宾语是that man.

he has a very happy family.
主语是he,谓语是has，宾语是family

A man is sitting on the desk.
主语是a man,谓语是is,宾语是sitting,补语是on the desk

You see the green leaves on the tree.
主语是you,谓语是see,宾语是green leave

Tim ran back to get the black hat and the red bag.
主语是Tim,谓语是ran back,宾语是the