usually/always/often可以替换使用吗?

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• 可以用usually回答how often吗?
• often可以放在句子后的吗?如：you should back up your data often.和you should back up your data usually.有何区别这两句?
• always often usually 等词能与一般过去时连用吗?
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• often,always,usually,sometimes之类的词可以放在句首或句末吗
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