أهمية الأصل واضحة.

Because this is a nominal sentence in Arabic. In the present tense, Arabic often does not use a separate word for is/are.

So:

• أهمية الأصل واضحة.
• literally: The importance of the origin/source clear
• naturally: The importance of the origin/source is clear

If you wanted the past tense, you would usually add a verb such as كانت:

• كانت أهمية الأصل واضحة.
• The importance of the origin/source was clear.

The subject is أهمية الأصل and the predicate is واضحة.

More specifically:

• أهمية الأصل = the topic being talked about
• واضحة = what is being said about it

So the structure is:

• أهمية الأصل = the importance of the origin/source
• واضحة = clear

This is a very common Arabic pattern:

• [noun phrase] + [adjective/predicate]

Because أهمية الأصل is an iḍāfa construction, often called the construct phrase.

In an iḍāfa:

• the first noun is possessed or defined by the second noun
• the second noun is normally genitive

So here:

• أهمية = importance
• الأصل = the origin/source/root/principle
• أهمية الأصل = the importance of the origin/source

That is why الأصل is grammatically genitive: in full vocalization, it is الأصلِ.

This is another feature of iḍāfa.

In an iḍāfa:

• the first noun usually does not take الـ
• the second noun determines whether the whole phrase is definite

So:

• أهمية أصل = importance of an origin/source
• أهمية الأصل = importance of the origin/source

Even without الـ on أهمية, the whole phrase أهمية الأصل can still be definite because the second noun الأصل is definite.

Because it agrees with أهمية, which is grammatically feminine.

The word أهمية ends in ة (tāʾ marbūṭa), and nouns of this type are usually grammatically feminine. So the predicate adjective must also be feminine:

• masculine: واضح
• feminine: واضحة

That is why Arabic uses:

• أهمية الأصل واضحة

not:

• أهمية الأصل واضح

This is a very common question. The answer is: واضحة here is not an attributive adjective inside the noun phrase. It is the predicate of the sentence.

Compare these two patterns:

1. Attributive adjective (inside a noun phrase)

   • الأهمية الواضحة = the clear importance
     Here the adjective must match definiteness, so both words are definite.

2. Predicate adjective (part of a full sentence)

   • أهمية الأصل واضحة = The importance of the origin/source is clear
     Here واضحة is the predicate, so it is normally indefinite.

So although Arabic adjectives often match definiteness, that rule applies to modifying adjectives, not automatically to predicates.

In fully vocalized MSA, it would be:

• أَهَمِّيَّةُ الأَصْلِ وَاضِحَةٌ

The endings are:

• أهميةُ — nominative, because it is the subject of the nominal sentence
• الأصلِ — genitive, because it is the second term of the iḍāfa
• واضحةٌ — nominative, because it is the predicate

In ordinary writing, these short vowels are usually omitted, so you normally just see:

• أهمية الأصل واضحة

Yes. In this sentence, the ة in أهمية is pronounced because the word is in an iḍāfa construction and is followed by another word.

So in connected speech, it is pronounced like a t sound:

• أهمية الأصل ≈ ahammiyyat al-aṣl

If the word stood alone, the final ة would usually sound more like -ah in pause:

• أهمية ≈ ahammiyyah

This is a very important pattern with tāʾ marbūṭa:

• alone/in pause: often -ah
• before another word in grammar like iḍāfa or with case endings: -t

Yes, but أهمية الأصل واضحة is the most straightforward and neutral order.

This sentence uses the common pattern:

• subject first, then predicate

Arabic can sometimes put the predicate first for style, emphasis, or a more literary effect, but for learners the normal order here is best:

• أهمية الأصل واضحة

So if your goal is clear, standard MSA, this is the form to remember first.

You should think of أهمية الأصل as one noun phrase, not as two separate ideas.

So mentally group it like this:

• [أهمية الأصل] [واضحة]
• [the importance of the origin/source] [is clear]

That grouping helps you understand both the grammar and the meaning:

• أهمية الأصل = one complete phrase
• واضحة = the comment about that phrase

This is often the easiest way for English speakers to parse Arabic nominal sentences.