היא נראית עייפה, אבל היא נשמעת שמחה עכשיו.

Because the subject is היא = she, so the words that describe her are feminine singular.

You can see that in:

• נראית = looks/seems (feminine singular)
• עייפה = tired (feminine singular)
• נשמעת = sounds (feminine singular)
• שמחה = happy (feminine singular)

If the subject were הוא (he), you would usually get:

• הוא נראה עייף, אבל הוא נשמע שמח עכשיו.

• נראית literally means is seen / appears / looks
• נשמעת literally means is heard / sounds

In natural English:

• היא נראית עייפה = She looks tired
• היא נשמעת שמחה = She sounds happy

So Hebrew uses these verbs much like English uses looks and sounds.

In Hebrew, the verb to be is usually not written in the present tense.

So Hebrew says:

• היא עייפה = She is tired
• literally: she tired

But in your sentence, נראית and נשמעת are already present-tense forms meaning looks and sounds, so the sentence does not need a separate word for is.

This is an important difference:

• היא עייפה = She is tired
• היא נראית עייפה = She looks/seems tired

The second one is less direct. It describes an impression, not necessarily a fact.

The same idea applies here:

• היא שמחה = She is happy
• היא נשמעת שמחה = She sounds happy

So the sentence suggests:

• she appears tired
• but from her voice or tone, she sounds happy

Yes, Hebrew can sometimes leave it out, especially when the subject is already clear from the verb.

So these are both possible:

• היא נראית עייפה, אבל היא נשמעת שמחה עכשיו.
• היא נראית עייפה, אבל נשמעת שמחה עכשיו.

However, repeating היא is very natural and often sounds clearer, especially in a learner sentence. It also mirrors English structure nicely:

• She looks tired, but she sounds happy now.

עכשיו means now, and Hebrew often places time words:

• at the end of the sentence
• at the beginning
• or sometimes in the middle

So these can all work, depending on emphasis:

• היא נשמעת שמחה עכשיו. = She sounds happy now.
• עכשיו היא נשמעת שמחה. = Now she sounds happy.
• היא עכשיו נשמעת שמחה. = also possible, though often less neutral

Putting עכשיו at the end is very common and natural.

A rough pronunciation guide:

• נראית = nir-EIT or nir-eh-EET, depending on speaking style
• נשמעת = nish-MA-at

And the whole sentence roughly sounds like:

hee nir-EIT aye-feh, a-VAL hee nish-MA-at smeh-KHA akh-SHAV

A few notes:

• ח in שמחה is a throaty sound that English does not really have.
• ע in נשמעת is often very weak or silent in modern Israeli Hebrew pronunciation.

Yes. They are adjectives describing she:

• עייפה = tired
• שמחה = happy

In Hebrew, adjectives usually agree with the noun or pronoun they describe in gender and number.

So:

• feminine singular: עייפה, שמחה
• masculine singular: עייף, שמח
• feminine plural: עייפות, שמחות
• masculine plural: עייפים, שמחים

They are present-tense forms of the verbs:

• להיראות = to look / appear
• להישמע = to sound / be heard

In Hebrew grammar, present-tense forms often behave a bit like adjectives or participles, and they agree with the subject in gender and number.

That is why you get:

• היא נראית
• הוא נראה
• הן נראות
• הם נראים

and similarly:

• היא נשמעת
• הוא נשמע
• הן נשמעות
• הם נשמעים

Hebrew, like English, often uses sensory verbs to describe impressions:

• נראה / נראית = looks / seems visually
• נשמע / נשמעת = sounds / seems from the voice
• sometimes also מרגיש / מרגישה = feels

So the sentence creates a contrast:

• visually, she seems tired
• from the way she sounds, she seems happy

That contrast is highlighted by אבל = but.

It is normal and natural to use a comma before אבל when it connects two full clauses, just like English often does before but.

So:

• היא נראית עייפה, אבל היא נשמעת שמחה עכשיו.

This punctuation is standard and helps show the contrast clearly.