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Questions & Answers about Çok çalışmak iyi.
Why does the verb çalışmak have a -mak ending here?
The -mak suffix turns a verb into a verbal noun, similar to adding "-ing" or putting "to" in front of a verb in English. Since we are talking about the concept of "working" (or "to work") as the subject of the sentence, we add -mak to the verb root çalış-.
Why is it çalışmak and not çalışmek?
The suffix has two forms, -mak and -mek, which follow the rules of 2-way vowel harmony. You look at the last vowel in the verb root. The root here is çalış-, and its last vowel is ı (a back vowel). Therefore, it takes the back-vowel suffix -mak.
Where is the word for "is" in this sentence?
There isn't an explicit word for it! In Turkish, simple statements in the present tense often don't need a "to be" verb. Simply placing the adjective iyi (good) at the end of the sentence naturally means "is good".
Does çok mean "very" or "a lot" here?
It means "a lot" here. Çok is a flexible word: when it comes before an adjective, it means "very" (like çok iyi for "very good"), but when it describes an action like çalışmak, it means "a lot" or "much".