be late for sth做某事迟到啦，为什么不说be late do sth 比如 I am late to have lunch.
推荐回答（2个）
1.be late fo sth 后接名词，如果你说，late for school，别人就知道你迟到了。
2.be late to do sth 提示做某事，如果你是 late to go to school，别人就知道你去学校这个动作迟到了，意味着你迟到了。
3.be late for doing sth 有for，介词后面用动词的ing形式。所以意思和第二个一样，书写形式不同。
be late for sth
be late of doing sth
be late to do sth
这3种说法都是对的
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