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Are these correct? What do these mean?
1. He could go there. (Is this correct? 'Could' is more polite than 'can', but if I use 'could' is it a conditional sentence?) Eg.:
2. He can go there. (This is correct, if I use 'could' is it incorrect? Do I have to make it into a conditional sentence?)
There is not enough context to interpret all the possible meanings of these sentences, Jack. However, as they stand:
1. He could go there. = it is possible or it was permissable for him to go there.
2. He can go there. = it is possible or permissible for him to go there.
2. He would go there. = it was his habit or it is his willfulness to go there.
3. He should go there. = it is a good idea for him to go there.
Would / Could 
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