问题描述：
英语提问：以下句子改写得对吗,帮我看看,有问题请指正,
原句:The Titanic was regarded as unsinkable.
改句1：The Titanic was considered as unsinkable.
改句2：The Titanic was thought of as unsinkable.
改句3：The Titanic was thought to be as unsinkable.
改句4：The Titanic was thought to be unsinkable.
原句:The Titanic was regarded as unsinkable.
改句1：The Titanic was considered as unsinkable.
改句2：The Titanic was thought of as unsinkable.
改句3：The Titanic was thought to be as unsinkable.
改句4：The Titanic was thought to be unsinkable.
问题解答：
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