新概念第二册第一课 i did not enjoy it.

新概念第二册第一课 i did not enjoy it.
i did not enjoy it.可否这样——i am not enjoy it.
何时用助动词do?
何时用BE动词?
何时要用宾语?
i did not enjoy it.
改成
i was not enjoy it.
是不是意思一样？