Tom's mother was ill,so he (had to) stay home and look after her为什么不是has to?

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Tom's mother was ill,so he (had to) stay home and look after her为什么不是has to?

Tom's mother was ill,so he (had to) stay home and look after her为什么不是has to?
Tom's mother was ill,so he (had to) stay home and look after her
为什么不是has to?

Tom's mother was ill,so he (had to) stay home and look after her为什么不是has to?
前面是was