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は泥だらけだった

was covered in mud

→ は
phrase Rare #39,549
was covered in mud Used to say that something or someone was muddy or covered with mud. The は marks the topic, and だった makes the expression past tense.
JA: 子どもの靴は泥だらけだった。
EN: The child's shoes were covered in mud.

トムの長靴は泥だらけだった。

Tom's rubber boots were covered in mud.

彼の手は泥だらけだった。

His hands were covered in mud.

トムの手は泥だらけだった。

Tom's hands were covered in mud.

彼は泥だらけだった。

He was covered in mud.