I was busy this morning 用三单作主语怎么改过去式could 怎么改

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I was busy this morning 用三单作主语怎么改过去式could 怎么改
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I was busy this morning 用三单作主语怎么改过去式could 怎么改
I was busy this morning 用三单作主语怎么改过去式
could 怎么改

I was busy this morning 用三单作主语怎么改过去式could 怎么改
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He was busy this morning.
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She could have been busy this morning