الأمل مهم.

Because this is a nominal sentence in Arabic. In the present tense, Arabic often says X Y without a word for is.

So:

• الأمل مهم
• literally: the hope important
• natural English: Hope is important

Arabic usually leaves out is/am/are in simple present-tense statements like this.

الأمل is made of:

• ال = the
• أمل = hope

So الأمل literally means the hope.

In Arabic, abstract nouns often appear with ال even when English uses no article, so الأمل مهم is naturally translated as Hope is important, not necessarily The hope is important.

Because مهم is the predicate of the sentence, describing الأمل.

In a basic Arabic nominal sentence, it is very common for:

• the topic/subject to be definite
• the predicate to be indefinite

So:

• الأمل = definite
• مهم = indefinite, meaning important

This pattern is very normal in Arabic.

Because الأمل is a masculine noun, and the adjective/predicate agrees with it in gender.

• masculine: مهم
• feminine: مهمة

Since أمل is masculine, we say:

• الأمل مهم

If the noun were feminine, you would use مهمة instead.

A careful pronunciation is roughly:

• al-amal

A few notes:

• أ gives a vowel like a
• مل ends with -mal
• the ل in ال is pronounced here, because أ is not a sun letter

So the article stays clear: al-amal, not a-amal or ash-shayء-type assimilation.

It is pronounced.

That is because أمل begins with أ, and أ is not a sun letter. Assimilation happens only before sun letters such as ت، د، ر، س، ش، ن and others.

So:

• الأمل = al-amal

The l sound remains.

It is roughly:

• muhimm

A few details:

• the first syllable sounds like mu
• the middle has a doubled m sound in careful pronunciation
• the last part is -imm

So it is not moham or muham. A better approximation is muhimm.

مهم is an adjective meaning important.

In this sentence, it functions as the predicate: it tells you something about الأمل.

So structurally:

• الأمل = the thing being talked about
• مهم = what is being said about it

In fully vowelled formal Arabic, you could write:

• الأملُ مهمٌّ

Those ending vowels show grammatical case:

• الأملُ = nominative
• مهمٌّ = nominative

But in normal everyday writing, short vowels and case endings are usually omitted, so you just see:

• الأمل مهم

That is completely standard.

Yes, depending on context.

Arabic الأمل literally contains the, so in some contexts The hope is important could be possible. But in a general statement about the concept of hope, the most natural English translation is:

• Hope is important

So the best translation depends on whether the sentence is talking about hope in general or a specific hope already known in context.

The structure is:

• الأمل = subject/topic (مبتدأ)
• مهم = predicate (خبر)

So this is a very basic nominal sentence pattern in Arabic:

• definite noun + adjective/predicate

You can use this same pattern in many simple sentences, such as:

• الجو جميل = The weather is beautiful.
• الكتاب مفيد = The book is useful.
• الوقت قصير = Time is short.

Usually that would not mean the same thing.

• الأمل مهم = Hope is important / The hope is important
• أمل مهم = an important hope

Without ال, أمل becomes indefinite, and the phrase is more likely understood as a noun plus adjective phrase, not a complete sentence with the same meaning.

So if you want the sentence Hope is important, use:

• الأمل مهم

Yes. It is completely normal and correct in Modern Standard Arabic.

It is short, clear, and very typical of textbook Arabic:

• abstract noun with ال
• simple predicate adjective
• no present-tense to be

So it is a good model sentence for beginners.