S+be+adj+to do sth S+be+adj+to have done

S+be+adj+to do sth S+be+adj+to have done be adj to do/ be adj to be done 主语+be+adj+to do sth 例句 be+adj+to do sth 造句 be adj to sb/do sth sb be adj to do sth. be adj enough to do sth造句 sth+be+adj+to+do造句 be +adj + to do It's adj to do sth 例句 It's adj to do sth cross the road It's+adj+to do sth for sb between...and... be