辨析 fall/come/get ill与be/fell ill

辨析 fall/come/get ill与be/fell ill fall ill和fell ill的区别 fall ill和be ill fall ill = be ill fall ill与feel ill区别 用fall ill-be ill（短暂性动词）造句 fell sick 和 fell ill I often fall ill 用fall ill 造句 fall ill 什么词性 i'm ill还是i fell ill? 求教!Be careful not to fall ill．