Questions & Answers about Tehlikeyi hafifsemek büyük bir hatadır.
How does the word hafifsemek relate to the lesson's suffix -(I)msEmEk?
The root is the adjective hafif (light). The suffix used here is a shorter variant, -se, which acts just like -(i)mse to mean "to perceive something as [adjective]" or "to treat it as [adjective]". Therefore, hafifsemek literally means "to perceive as light," which translates to underestimating or taking something lightly. Another common example using this shorter variant is önemsemek (to consider important).
Why is tehlike in the accusative case (tehlikeyi) when the whole phrase acts as the subject of the sentence?
Even though the infinitive phrase tehlikeyi hafifsemek acts as the subject of the sentence, the verbal noun hafifsemek still behaves like a verb internally. Because it is a transitive verb acting on a specific, definite danger, it requires its own direct object to take the accusative case -(y)i.
Why is the word order büyük bir hatadır instead of bir büyük hatadır?
In Turkish noun phrases, descriptive adjectives almost always come before the indefinite article bir. So the standard pattern is [Adjective] + bir + [Noun], which is the opposite of the English word order "a big mistake".
Is the -dır suffix on hatadır absolutely necessary?