1 . 下列句子中各有一处语言错误，请把错误改正，其他部分不得改动。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧），并在右边横线上声出该加的词。
删除：把多余的词用斜线（\）划掉，并在右边横线上写出’该词，也用斜线划掉。
修改：在错的词下划一横线，并在右边横线上写出改正后的词。
1. Play basketball is fun.
2. Tom is tallest in his class.
3. There is many trees in our school.
4. The boy, calling Tom, is the most hard-working student in our class.
5. We should to study hard.