你可能感兴趣的试题
didn't you did you haven't you have you
Must; doesn’t have to Do; don’t have to Must; don’t have to Must; mustn’t
didn’t; must have been playing didn’t; must be playing couldn’t; must have played couldn’t; must be playing
Must; doesn’t have to Do; don’t have to Must; don’t have to Must; mustn’t
have you did you haven’t you didn’t you
studied was studying am studying would study
must say should say must have said should have said
mustn’t;can needn’t;must don’t have to;may can’t have to;may
didn't; must be playing couldn't; must be playing couldn't; must have played didn't; must have been playing
studied was studying am studying would study
must, mustn’t must , don’t have to may, needn’t may , mustn’t
you must there’s no need you needn’t have you needn’t to
have to, may be, may needn’t, must have to, must
can;being read must;to be read may;reading must;reading
have you did you haven’t you didn’t you
do; don’t have to do; mustn’t must; don’t have to must; mustn’t
mustn’t; must mustn’t; may needn’t ; may don’t have to; must
must mustn't have to don't have to
mustn’t; may may not; must don’t have to; may shouldn’t; must