1. 我走路去学校，看到发生的一起车祸，但我马上要去学校（用到walk happen look come)
译：I happened to look at an accident when I was walking to school, but I have to go to school shortly.
(本句中的look at是由于提问者指定使用，其实用saw更好)
2. 我看到一只小鸟出现，它飞着也歌唱着。（用到look fiy sing appear）
译：I looked at a bird appear, which was flying and singing.
（这句中的看到也用saw更合适）
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