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What is the past of 'go' ?
went
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What is the past of 'invent' ?
invented
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What is the past of 'is' ?
was
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What is the past of 'build'?
built
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What is the past of 'protect'?
protected
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What is the past of 'study'?
studied
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What is the past of 'win'?
won
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What is the past of 'learn'?
learned / learnt
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What is the past of 'design' ?
designed
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What is the past of 'discover' ?
discovered
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