have a good time的同义词有：have a wonderful/great/nice time；enjoy oneself；have fun等，have a good time意为玩的很开心。
had a good time用法表示“玩的很开心，玩的很快乐，过得愉快， 玩得痛快”
We can just hang out and have a good time.
我们可以只是闲逛一下，开开心。
2.用于have a good time (in) doing sth，表示“做某事很开心”。如：
You'll have a good time enjoying Beijing and the olympics.
你在北京和奥运会期间将度过一段愉快的时光。
小结
It's time for +名词、名词短语、动名词（动词ing形式）
It's time + to动词、动词短语
It's time that + 过去时的从句。（前期文章有所介绍）
例句
They have a good time together.
他们一起过得很愉快。
We'll have a good time.
我们会玩得很开心的。
But did we have a good time here?
我们在这度过了一段美好的时光不是吗?
You can have a good time.
你能玩的很高兴。
Would I have a good time?
我会玩得愉快吗？
