noun
1
BAD : You should try to keep the car in a good condition.
GOOD : You should try to keep the car in good condition.
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in good/excellent/perfect/bad/terrible ... condition (WITHOUT a/an ): 'Most of the CDs were still in excellent condition.' 'What sort of condition is the car in?'
2
BAD : They are forced to live in a terrible condition.
GOOD : They are forced to live in terrible conditions.
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When you describe the situation in which someone lives or works, use conditions : 'Latest reports from the capital suggest that the conditions there are getting worse.' 'How do they manage to survive in such dreadful conditions?'
3
BAD : How are you? I hope you're in good condition.
GOOD : How are you? I hope you're keeping fit and well.
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in good condition/shape = physically fit and strong because you do exercises: 'Most of the team had kept themselves in good condition during the summer months.'
To enquire about or refer to someone's general state of health, use well or fit and well : 'Sarah has a bit of a cold but apart from that we're all well and looking forward to the summer holiday.'