We do not know the reason why he suddenly fall ill.
我们不知道他突然生病的原因。
He would be fine for quite a while, but would then fall suddenly ill and have to be admitted to the hospital.
他有时会好一阵子，但是其后又会突然生病，必须去医院治疗。
He would be fine for quite a while, but would then fall suddenly ill and have to be admitted to the hospital.
他有时会好一阵子，但是其后又会突然生病，必须去医院治疗。
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