1 Sam will catch9 o'clock train to London tonight.(改为否定句)
1 Sam will catch9 o'clock train to London tonight.(改为否定句)
2 They have already washed their clothes.(改为否定句)
3 Carol's brother goes to work at9 every day.(改为否定句)
4 Look,the birds are singing.(改为否定句)
5 Listen,someone is reading books.(改为一般疑问句)