had had是什么时态

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• had better do sth可以默认为一般过去式吗例如You had better take a map with you when travel so that you wouldn't get lost.
• would you like some pears?--No,thanks.I think there ___ enough for usA.is B.are C,has been D.had beenc是不是应该改为have been因为pears 是复数,B也错了,因为要用完成时态请问,你觉得呢?
• had better do中的had是不是表示过去式
• I usually spend my weekend watching television在这句中usually是一般现在时态,但后面又用现在分词,这句句子是什么时态
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• had用于什么时态