be ill 生病 那天是过去时间，所以be改成过去式was
I'm seriously ill.
I saw a girl of our shcool badly ill.
因为ill是形容词必须是be＋adj.that day是"那天"，是一般过去时的标志
he had a badly ill yesterday.
yesterday he got sick，and his illness was seriously completely
He was in serious sick yesterday
I met with a very serious disease girl school
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张小天11
