Last spring my wife suggested that I call in a man to look at our lawn mower. It had broken down the previous summer, and though I promised to repair it, I had never got round to it.

I would not hear of the suggestion and said that I would fix it myself.

1) 从时间上看，promised在前，got round to it 在后，所以，为什么前者没有使用过去完成时，只使用了一般过去时，而后者恰恰相反，反而使用了过去完成时，没有使用一般过去时呢？

    另外，hear of the suggestion 是听说过这个建议吗？为什么不是 listen to the suggestion 呢？

One Saturday afternoon, I hauled the machine into the garden and had a close look at it. As far as I could see, it needed only a minor adjustment: a turn of a screw here, a little tightening up there, a drop of oil and it would be as good as new. Inevitably the repair job was not quite so simple. The mower firmly refused to mow, so I decided to dismantle it. The garden was soon littered with chunks of metal which had once made up a lawn mower. But I was extremely pleased with myself. I had traced the cause of the trouble. One of links in the chain that drives the wheels had snapped. After buying a new chain I was faced with the insurmountable task of putting the confusing jigsaw puzzle together again. I was not surprised to find that the machine still refused to work after I had reassembled it, for the simple reason that I was left with several curiously shaped bits of metal which did not seem to fit anywhere.

2)  reason that...应该是同位语从句，不是定语从句吧？我感觉这里的I was left with中的with 可以不需要也是正确的？这里的shaped是形容词“形状的”意思吗？

3) which did not seem to fit = which seemed not to fit 吗？ seem也需要否定前移吗？

I gave up in despair. The weeks passed and the grass grew. When my wife nagged me to do something about it, I told her that either I would have to buy a new mower or let the grass grow. Needless to say our house is now surrounded by a jungle. Buried somewhere in deep grass there is a rusting lawn mower which I have promised to repair one day.

4) "Buried somewhere in deep grass " 和 “ which I have promised to repair one day” 二个定语都是修饰 a rusting law mower 吗？还有为什么不是which I promised 过去时？对比前面的 and though I promised...是过去时，可是最后which I have promised...为何又使用了现在完成时呢？