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Does anybody remember which words are used with countable nouns and which with uncountable?
Could you post it?
And you can practise in these sites

I agree with you! It looks very difficult, but it's not 
| Present | Past |
Meaning |
| Am | Was | ser/estar |
| Is | Was | ser/estar |
| Are | Were | ser/estar |
| Do | Did | no translation only in questions and negatives |
| Does | Did | no translation only in questions and negatives |