1) I could ride a horse when I was young. (ok--past ability) 2) I could go to the USA yesterday. (ok but needs some further context; perhaps you've lost your passport today and can't go to the US now but you could go yesterday) 3) I could have gone to the US yesterday but I didn't want to.
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TicceOk so if we say it in the indicative mood then it can refer to the past. As it is here1) I could go to the USA when I was young but I didn't want to. (I hope you don't see it as a conditional sentence--fine)
But if could is used in a conditional sentence then it always refers to the present or future as it is here Not quite, in the case of conditio
IvanhrBut if could is used in a conditional sentence then it always refers to the present or future as it is here Not quite, in the case of conditional III sentences it refers primarily to the past (but some mixed conditional sentences can refer to the past and present at the same time) .In the third sentence we don't have "could" but we have "coul
IvanhrI could have gone to the US yesterday if I had wanted to (but I didn't want to).It seems like you are saying that these two are the same