He (can/could) ____ be from Sheffield,judging by his accent.With luck,tomorrow (can/could) ___ be a cooler day.这两题为什么都填could,而不是can?

The policeman is telling the man ____(how he can get to ,how he could get to )the subway快啊快啊 He (can/could) ____ be from Sheffield,judging by his accent.With luck,tomorrow (can/could) ___ be a cooler day.这两题为什么都填could,而不是can? He can ____(swim) well. 将下列各句变为宾语从句的复合句.1.when do the Smiths leave Haikou ?He asks.He asks ____ ____ ____ ____ Haikou.2.Where did you find the book ?Could you tell me?Could you tell me ____ you ____the book ?3.He can't work out the math problem 他算不出来 He can't ____ ____ ____. 在He hopes he could 好,还是can好? he can use pumpkins to make lanterns.（同义句） he can ____ ____ ____. He can hardly see anything,________?A.can't he B.could he C.can he D.couldn't he 1.Tom ____ the accident ____ ____ ____ ____ (亲眼目睹）.He could tell you in detail.2.This ____ in a short time.We still have something more important to do.A.can't be done B.can done C.mustn't be done D.have been finished .3.Put the stone ____ He could hardly walk without a stick,____?反义疑问句 He ask ____ I could show him the way. He can finish the work ____(easy) He can't ____ (play) volleyball He can draw ____(龙)very well He studied hard so that he could catch up with other(改为同义句)He studied harder ____ ____ ____ At last,afted a year he could not wait any longer转变为____,a year_____,he could ____ ____wait. He could swim across the Yangtze river when he was 12 years old.He could swim across the Yangtze river ____ ____ ____ of 12. .he can hardly speak french改为反义疑问句 .he can hardly speak french ____ ____?