我昨天忘记打电话给钟斯先生，虽然我答应了在三点钟的时候打电话给他的。
I forgot to call up Mr. Jones yesterday although I promised to call him up exactly at three o 'clock.
我要是知道他的号码，昨天也许就给他打电话了。
If I had known his number, I might have telephoned him yesterday.
我昨天忘记打电话给琼斯先生，虽然我答应了在三点钟的时候打电话给他。
I forgot to call up Mr. Jones yesterday although I promised to call him up at three o 'clock.
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