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帮忙看一下下列几个句子是什么时态!

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帮忙看一下下列几个句子是什么时态!
1.I had been at the bus stop for half an hour when a bus finally came.
2.John Baird went off into the room where the picture would be shown.
3.This piece of good news greatly surprised all of my classmates.
4.I've been to Americe many times.
帮忙看一下下列几个句子是什么时态!
1.过去完成时+一般过去
2.一般过去+过去将来
3.一般过去
4.现在完成