假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。
增加：把缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者（从第11处起）不计分。
Yesterday is my mother's birthday. My father and I planned to give him a surprise. In the morning, like usual, my father and mother went to work but I went to school at eight o'clock. My mother seemed to have forgotten her birthday. At four o'clock in the afternoon my father bought a bunch of flowers as well a lot of delicious food my mother likes to eat. I bought my mother a large and beautiful birthday cake. When my mother got to home, she was greatly surprised by that she saw. All that we had done made her very happily. After supper, I asked my mother to sit up and watch TV. My father began to clean the floor and I set out to doing the washing-up.