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
She was busy this morning.
I could be busy this morning,

He was busy this morning.
Could he be busy this morning?

He was busy this morning.
He could have been busy this morning.

She could have been busy this morning