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give a hard time使他做……非常不容易
have a hard time doing sth做……不容易，做……有困难
例句：He would have a hard time contradicting her.
跟她作对，他不会有好日子过的。
I have a hard time for memorizing words.
我背单词都背怕了。
2.She kicked her back legs and stepped into the bucket that was supposed to catch her milk.
be supposed to被认为,据说,应该
例句：Vitamin C is supposed to prevent colds.
维他命C被认为能预防感冒。
You are not supposed to do that.
你不可以做那个。
3. The milk goes directly from the goat into a container that is then placed in the refrigerator to keep the milk cold.
that is then placed是定语从句，修饰container。to keep the milk cold表示目的。
4.So he began to develop a device of his own.
of his own所有格
of+名词结构表示所属关系：
1)当表示拥有者的名词由短语或从句修饰时用of+名词结构：
The boys ran about，obeying the directions of a man with a whistle．
男孩子们按带哨子的男人的指示四处奔跑。
I took the advice of a couple I met on the train and hired a car．
我听从了在火车上遇见的一对夫妇的建议，租了一辆小汽车。
2)除了上述所列的名词外，无生命的拥有者也要用of+名词结构表示：
the walls of the town城市的城墙
the roof of the church教堂的屋顶
the keys of the car小汽车的钥匙
