Tell me some grammars: 'have a good time' and 'have good time'

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Jan 25, 2019 06:20 Japan Diary
I was confused with two grammar problems.
Can I ask you tell me some about them?

1. What is the difference between 'have a good time' and 'have good time?'
2. What is the difference between ' near future' and 'in the near future?'
And which is better to use at the bottom of sentences?
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