امیدوارم که فردا حالش بهتر باشد؛ من مطمئن نیستم که امروز بتواند به کلاس بیاید.

حالش is حال + ش.

• حال = condition, state, how someone feels
• ـش = his/her

So حالش literally means his/her condition or how he/she is feeling.

In this sentence, حالش بهتر باشد means something like may he/she be feeling better or his/her condition be better.

که introduces a subordinate clause, similar to English that.

So:

• امیدوارم که... = I hope that...
• مطمئن نیستم که... = I’m not sure that...

In Persian, که is very common after verbs and expressions like hope, know, think, be sure, be afraid, and so on.

It is sometimes optional in casual speech, but in sentences like this it sounds very natural and standard.

Because after امیدوارم (I hope), Persian normally uses the subjunctive.

• است = is
• باشد = be / may be

So:

• حالش بهتر است = his/her condition is better
  This sounds like a statement of fact.
• حالش بهتر باشد = I hope his/her condition is better / may be better
  This expresses hope, not certainty.

That is why باشد is the correct choice here.

They are also in the subjunctive, because the speaker is talking about something uncertain.

In the second clause:

• من مطمئن نیستم که... = I’m not sure that...

Since the speaker is not certain, Persian uses the subjunctive:

• بتواند = be able to / may be able to
• بیاید = come / may come

Also, after توانستن (to be able), the following verb is commonly in subjunctive form too:

• می‌تواند بیاید = he/she can come
• بتواند بیاید = he/she may be able to come

So both forms are natural here.

Persian often uses the present subjunctive for future or non-factual situations when the time is already clear from context.

Here, فردا already tells you the action/state is in the future. So Persian does not need a separate future form here.

• فردا حالش بهتر باشد = that tomorrow he/she be feeling better

This is very normal Persian. English often uses different tense patterns, but Persian relies a lot on context words like فردا.

It can mean either his or her.

Persian does not distinguish gender in this kind of pronoun:

• ـش = his / her / its, depending on context

So from this sentence alone, you cannot tell whether the person is male or female. The broader context would tell you.

Because آمدن often takes به when meaning to come to a place.

So:

• به کلاس بیاید = come to class

This is the normal structure:

• به خانه آمدن = to come home
• به مدرسه آمدن = to come to school
• به کلاس آمدن = to come to class

In English, to is a separate word; in Persian, that role is often played by به.

Yes. Persian often drops subject pronouns when the verb already makes the subject clear.

• مطمئن نیستم already means I am not sure
• من مطمئن نیستم adds I explicitly

So both are correct. Including من can add slight emphasis or make the sentence feel a bit clearer or more balanced, but it is not required.

بهتر means better. It is the comparative form of خوب (good/well).

In حالش بهتر باشد, it describes the person’s condition:

• حال = condition/state
• بهتر = better

So the idea is his/her condition be better or more naturally he/she feel better.

Yes, Persian word order is somewhat flexible, especially with time expressions like فردا and امروز.

For example, these are also possible:

• امیدوارم که حالش فردا بهتر باشد
• من مطمئن نیستم که بتواند امروز به کلاس بیاید

The original version is very natural and clear. Putting فردا and امروز early in the clause helps frame the time right away.

In everyday speech, it would often sound more like:

امیدوارم که فردا حالش بهتر بشه؛ من مطمئن نیستم که امروز بتونه به کلاس بیاد.

Common spoken changes are:

• باشد → بشه
• بتواند → بتونه
• بیاید → بیاد

The written sentence you were given is standard and correct, but the spoken version is what you would hear more often in conversation.

The semicolon links two closely related statements:

1. I hope he/she feels better tomorrow
2. I’m not sure he/she can come to class today

They are separate clauses, but they are clearly connected in meaning. The second explains the concern behind the first.

In Persian writing, a semicolon works much like it does in English. A comma or a full stop could also appear in some contexts, but the semicolon is a neat, formal written choice.