翻译：他突然想起已经有一个多月没给母亲打电话了。(occur)

He suddenly occured that he didn't give his mother a phonecall more than a month.

He suddenly recall has been more than a month did not give the mother phoned

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It suddenly occurs to him that it's been more that a month since he last time called her mom.

It occurs to him that he hasn't call his mother for almost a month.

第一个和第二个典型的机器翻译。
He suddenly found it is more than a month that he did not called his mother.