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When I passed the school, I saw her dancing. 當我走過學校時，看見她正在跳舞。　　

When I passed the school, I found [learned] she was about to dance.  當我走過學校時，看見他正要跳舞。　　

When I got to the airport, I found [learned] the plane was about to take off. 當我們到達機場時，看到飛機正要起飛。　　

When I got to the airport, I found [learned] the plane had taken off.  當我們到達機場時，看到飛機已經起飛了。

When I got to the airport, I saw the plane  taking off.  當我們到達機場時，看到飛機正在起飛。