はとても面白い

is very interesting

→ は
phrase Common #8,002
is very interesting は marks the topic; the thing being described usually comes before it.
JA: この映画はとても面白い。
EN: This movie is very interesting.

トキポナはとても面白い言語です。

Toki Pona is a very interesting language.

バスケットボールはとても面白い。

Basketball is very interesting.

マークの本はとても面白い。

Mark's book is very interesting.

彼女の本はとても面白い。

Her book is very interesting.

昨日読んだ本はとても面白い本だ。

The book I read yesterday is very interesting.

フィンランド語はとても面白い言語なのよ。

Finnish is a very interesting language.

トムはとても面白い男だった。

Tom was a very funny man.

このSF小説はとても面白い。

This science fiction novel is very interesting.

彼の本はとても面白い。

His book is very interesting.

ローマの歴史はとても面白い。

The history of Rome is very interesting.