解释下列句子.1.They left SZ in 19982.It's impolite to interrupt pt

解释下列句子.
1.They left SZ in 1998
2.It's impolite to interrupt pthers.
3.I will stat here for another two days.
4:The car is too expensice for me to buy
5:I bought this house two years ago.
6:She joined the computer club three years ago.
7:He succeeded in climbing the top of the mountain.
不是翻译哦..是解释句子.