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1 I would have been able to help him,but I---so busy.

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1 I would have been able to help him,but I---so busy.
A were B had been C was D would be
2 my memory is very poor.If i ---his telephone number.i would ring him up.
A were to forget B don't forget C should remember D had remembered
1 I would have been able to help him,but I---so busy.
C was 这里我很忙,是真实情况,用过去时态
C should remember 与将来的事实可能相反
如果我能想起他的号码,我就给他打电话.
(1) If it should rain tomorrow,I would stay at home.要是万一 明天下雨,我就呆在家里不出去.事实上 现在天气很好,明天下雨的可能性应该不大,不过也说不准.
(2) If I should see her next Monday,I would tell her about it.如果下周一我能见到她的话我就把这件事告诉她.