Learn Turkish: Hücre, küçük bir mikroskop ile görüldü. - The cell was seen with a small microscope.

The root is gör- (to see). To make it passive (to be seen), we add the passive suffix -Il. Following 4-way vowel harmony for a word with an ö, it becomes -ül, giving us görül-. Finally, we add the past tense suffix -dü, resulting in görüldü (was seen).

Why does it say küçük bir mikroskop and not bir küçük mikroskop?

In Turkish, when you use an adjective with the indefinite article bir (a/an), the standard word order is Adjective + bir + Noun. So a small microscope is strictly küçük bir mikroskop. Saying bir küçük mikroskop would sound unnatural to a native speaker.

Could I write mikroskopla instead of mikroskop ile?

Yes! The word ile means with or by means of. It can stand alone as a separate word, or it can be attached to the previous noun as a suffix (-la or -le). Using mikroskopla means exactly the same thing and is actually more common in everyday spoken Turkish.

Why is there a comma after Hücre?

The comma is used here to clearly mark Hücre (the cell) as the grammatical subject of the sentence. In Turkish, it is very common to put a comma right after the subject to separate it from the descriptive phrases that follow, which makes the sentence much easier to parse.