Here is a frog on the window.

Grammatically, they are OK.
The first one is a bit implausible, though. Frogs usually can't stick to glass.

When talking about something which is actually in our presence, we might say 'here', often accompanied by a gesture.

If we are talking about something more distant, or just making a general observation, we would usuall say 'there'.
Just as 'it' is a conventional word used, for example, when talking of weather - "it's raining" - so 'there' is used conventionally when making a general

AlpheccaStarsGrammatically, they are OK.
The first one is a bit implausible, though. Frogs usually can't stick to glass.

Frogs usually can't stick to glass in the UK either. However, many tropical species have powerful suckers and can stick to many surfaces. I've seen lizards on glass in the tropics, so seeing a frog on a window wouldn't surpr

Thanks!!

Don't I have to write them as follows, by using a comma?

Here is a frog, on the window.
Here is a swing, in the park.

Thanks!!

Don't I have to write them as follows, by using a comma?

Here is a frog, on the window.
Here is a swing, in the park.

No commas needed for ordinary uses.

If you use commas, it looks like poetry.

Here is a frog, in the water,
Here is a swing, and on it my daughter.

Woow!!

How clear and nice!!

Thanks!!