介词是短文改错中的一大考点，而介词又是难掌握的一种词类。大多数介词都有多种用法，如介词at;不同的介词还可能有相似的用法如in the morning ,on Monday morning 等，而且介词的位置，介词和副词的区别，以及介词与连词的连用等都是学习中的难点也是高考中考查的热点。
●难点磁场
1.(★★★★★) Evening came down. We spent the night in a hotel at the top of the mountain.
83. ________
2.(★★★★) I won’t be able to come in this time. 87. ________
3.(★★★★★)We practise for three times every week and often watch football match on TV together. 87. ________
