come 在这里是联系动词（系动词）be 是最基本的联系动词Suffering is the teacher of life.还有appear, become, get, remain, seem, go, turn 等American country music has become more popular.His face turned pale.一些表示感觉和知觉的动词也是这样, feel, look, smell, tastI feel cold in this room.Your mother looks young.
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