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彼が約束を守る

he keeps his promise

→ 彼
phrase Rare #28,941
he keeps his promise A clause meaning that he keeps or will keep his promise. The nonpast form 守る can describe a habitual action, a future action, or a general fact depending on context. It can be followed by と, かどうか, or こと.
JA: 彼が約束を守ると、みんな信じている。
EN: Everyone believes that he will keep his promise.

私は彼が約束を守ることを確信している。

I am confident that he will keep his promise.

彼が約束を守るのは言うまでもないことだ。

Needless to say, he keeps his promises.

君は彼が約束を守ると信じてよい。

You can trust him to keep his promise.

私は彼が約束を守るかどうか疑わしいと思う。

I doubt he'll keep his promise.

彼が約束を守るかどうかは疑わしい。

It's doubtful whether he'll keep his promise.

彼が約束を守る事は、易しい事ではなかった。

It wasn't easy for him to keep his promise.