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今日， きょう， こんにち， こんち， こんじつ
1. today, this day
2. these days, recently, nowadays
今天
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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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なくてもいい， なくてもよい， なくても良い， 無くても良い
1. need not, (not) have to
2. need not have, need not exist
不必；没有必要；不必如此，不必存在