改错题There're about two hundred teachers and thousand of stude

There're about two hundred teachers and thousands of students in their school .
( thousand -> thousands )
There is hardly any room even to sand in on bus,is there?( hardly 几乎不,表示否定,故应该是前否后肯,即isn't -> is )
再问： He has played football for half an hour,这个改为同义句————half an hour he began to play football
再答： （It's )half an hour (since ) he began to play football