When I was walking to the gym this morning, the river that in front of my house was frozen.

Is this natural? If it sounds unnatural or grammatically wrong, please let me know😊

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@Yukarichandayo

The river didn’t freeze at exactly the same time as you were walking next to it. So you need to say something like –

While I was walking to the gym this morning, I saw that the river in front of my house was frozen.

You see – you are reporting on what you saw, while doing an action. This is appropriate to the situation.