1楼：匿名用户
1.count up swans' number / count swans' number up / add up swans' number / add swans' number up / worked out swans' sum / figure out swans' sum
【注】：count up the number of sth. =count sth.
给…计数；worked out / figure out sth.' sum 计算…的总数
2.in danger
【注】：endangered =in danger，endangered作前置定语，in danger作后置定语
3.be no / exist no
【注】：there is =there exists，there are=there exist。
语法上都是对的，请根据与课文的相关度选择最佳项。
2楼：匿名用户
1.they count swans once a year. （改为同义句）
they keep count of swans every year.
(keep (a) count of...=count...)
2. the government should protect the endangerde animals.（改为同义句）
the government should protect the animals in danger.
(in danger可作表语和定语，在此作定语)
3. there won't be any elephants if we don't help them.（改为同义句）
there will be no elephants if we don't help them.
（no=not a/not any)
英语句型转换（改为同义句）,英语句型转换
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