1.there are some apples in the tree. 。错,in改成on (on the tree表示是树的一部分的树上,in the tree表示非树的一部分的"在树上")
2.I have forteen pears and fourty bananas.。错 forteen改成fourteen,fourty改成forty(拼写错)
3.I sit in front of the classroom。错 in front of 改成 in the front of (in the front of 是某物里部的前面,in front of 是某物外部的前方、前面)
4there are a lot of ducks in the feont of the house。错 in the front of 改成in front of(原因见7)
5.I made bed for a guest。错 made bed 改成 made the bed (一定要加the,固定用法“铺床”)
参考资料:http://zhidao.baidu.com/question/190947934.html