فکر می‌کنم که تنبلی یک بیماری است.

From Lesson 152:Abstract nouns (-i)·Farsi

Questions & Answers about فکر می‌کنم که تنبلی یک بیماری است.

How does the word تنبلی translate to "laziness"?
It comes from the adjective تنبل which means "lazy". By adding the stressed suffix (-i) to the end, it changes from an adjective into an abstract noun, giving us تنبلی (laziness).
Does بیماری (illness) use the exact same noun-forming suffix as تنبلی?
Yes! The base word is the adjective بیمار (sick or ill). Adding that same (-i) suffix turns it into the noun بیماری (illness). This suffix is one of the most common ways to build abstract nouns in Farsi.
Why does "I think" require two words (فکر می‌کنم)?
"To think" is a compound verb in Farsi, made of the noun فکر (thought) and the verb کردن (to do). Here, کردن is conjugated in the present tense for the "I" form, making فکر می‌کنم (literally "I am doing thought").
Can I drop the word که (that) in this sentence like we do in English?
Yes, you can! Just like in English where you can simply say "I think laziness is an illness", in spoken Farsi you can often drop که and it will still sound perfectly natural.

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