A question about ‘could’.
A question about ‘could’.
If one use the word 'could' in a sentence, it means this sentence is a past tense sentence, right? Therefore, should I use past tense in every sentence I will write of this paragraph or the whole passage?
Thanks for answering my question.

Question

A question about ‘could’.
A question about ‘could’.
If one use the word 'could' in a sentence, it means this sentence is  a past tense sentence, right? Therefore, should I use past tense in every sentence I will write of this paragraph or the whole passage?   
Thanks for answering my question.

Answer

'could' not only use for mention past story, it's use for indicate CHANCES.
eg:  1)  i could be there -  PAST
       2)  I could be there tomorrow - chance, may be

Answer

Could you do this for me before tomorrow? ....
The world could end tomorrow: you never know. ....
Your next contact could be the partner you have always dreamed of. ....
......
Once she tried, she found she could ride a bicycle.....
It could be said that the weather is unpredictable....
The fall of the Roman empire could be linked to X.
....
He tried hard, but found that he could not do it.

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