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いく， ゆく， 行く， 往く
1. to go, to move (towards), to head (towards), to leave (for)
2. to move through, to travel across, to walk along (e.g. a road)
3. to go (well, badly, etc.), to proceed, to turn out, to get along
4. to do (in a particular way), to go (with; a choice...
去，进行；穿过，走；做，试
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ことがある， 事がある
1. (for something) to have occurred, to have done (something)
2. (for something) to happen on occasion
(某事)发生，已完成(某事)；(某事)偶尔发生
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
