Questions & Answers about المصدر واضح.
Because this is a nominal sentence in Arabic. In the present tense, Arabic usually does not use a separate word for is / am / are.
So:
- المصدر واضح
- literally: the source clear
- natural English: The source is clear
This pattern is extremely common in Modern Standard Arabic:
- البيت كبير = The house is big
- الجو جميل = The weather is nice
If you want the full grammatical terms, المصدر is the subject/topic (مبتدأ) and واضح is the predicate/comment (خبر).