thatisapen的精选

thatisapen改成否定句为Thatisn&#39t，在thatis的is后面加not就是否定形式。thatis在英语中很常见，例如:thatisanapple.那是一个苹果。thatisn&#39tatomato.那不是西红柿。thatisapencil.那是一个根铅笔。thatisn&#39tap...