גם אנחנו צוחקים כשאמא מדברת על המסיבה של אתמול.

גם means also / too.

In this sentence, גם אנחנו means we also or we too.

Hebrew often places גם directly before the word it is adding emphasis to:

• גם אנחנו = we too
• גם אמא = Mom too
• גם צוחקים would sound different and would shift the emphasis

So here, the idea is that we are included along with someone else.

In Hebrew, the verb form often already shows the subject, so צוחקים can mean we laugh, they laugh (masculine/mixed), or sometimes depend on context.

Because the form is not completely unique to we, Hebrew often includes the pronoun אנחנו for clarity.

So:

• צוחקים by itself = laughing / laugh for a masculine plural or mixed group, depending on context
• אנחנו צוחקים = clearly we laugh / we are laughing

Including the pronoun is very normal and natural.

צוחקים is the present tense form of the verb לצחוק (to laugh).

Specifically, it is the masculine plural present form.

Hebrew present tense can often translate into English in more than one way:

• we laugh
• we are laughing

The exact English translation depends on context.

Hebrew present-tense verbs agree with gender and number.

• צוחקים = masculine plural
• צוחקות = feminine plural

If the group referred to by אנחנו is:

• all male, use צוחקים
• mixed male and female, Hebrew normally also uses צוחקים
• all female, use צוחקות

So this sentence suggests that the speakers are either:

• a group of males, or
• a mixed group

The dictionary form is לצחוק = to laugh.

A few related present-tense forms are:

• צוחק = laughing / laughs (masculine singular)
• צוחקת = laughing / laughs (feminine singular)
• צוחקים = laughing / laugh (masculine plural or mixed group)
• צוחקות = laughing / laugh (feminine plural)

So אנחנו צוחקים literally matches we [masculine plural/mixed] laugh / are laughing.

Because כש is a prefix meaning when.

So:

• כשאמא = when Mom
• literally: כש + אמא

This is very common in Hebrew. Short function words are often attached as prefixes.

You may also see the longer form כאשר אמא, which also means when Mom, but כש is more common in everyday speech.

Here כש means when.

So:

• כשאמא מדברת = when Mom talks / when Mom is talking

Depending on context, כש can introduce a time clause:

• כשאני בא = when I come
• כשיורד גשם = when it rains

In this sentence, it introduces the situation during which we also laugh.

Because the subject is אמא, which is feminine.

Hebrew verbs in the present tense agree with the gender and number of the subject:

• הוא מדבר = he speaks / is speaking
• היא מדברת = she speaks / is speaking

Since אמא is feminine singular, the sentence uses מדברת.

The dictionary form is לדבר = to speak / to talk.

Present-tense forms:

• מדבר = speaking / speaks (masculine singular)
• מדברת = speaking / speaks (feminine singular)
• מדברים = speaking / speak (masculine plural or mixed group)
• מדברות = speaking / speak (feminine plural)

So אמא מדברת means Mom talks or Mom is talking.

על means about / on / concerning, depending on context.

With the verb לדבר (to talk / to speak), Hebrew commonly uses על to mean talk about:

• לדבר על משהו = to talk about something

So:

• אמא מדברת על המסיבה = Mom is talking about the party

This is a very common verb + preposition combination that learners should memorize as a unit.

ה is the definite article, meaning the.

So:

• מסיבה = a party
• המסיבה = the party

The sentence is talking about a specific party, not just any party, so Hebrew uses המסיבה.

של often means of or shows a relationship similar to English 's.

So:

• המסיבה של אתמול literally = the party of yesterday
• natural English = yesterday’s party or the party from yesterday

This is a very common Hebrew structure:

• הספר של דני = Danny’s book
• החדשות של היום = today’s news
• המסיבה של אתמול = yesterday’s party

Hebrew often uses של where English might use 's or an adjective-like expression.

Because אתמול is an adverb/time word meaning yesterday, not a noun that normally takes the here.

So:

• אתמול = yesterday
• not האתמול in this kind of sentence

In המסיבה של אתמול, אתמול keeps its normal form.

It can mean either, depending on context.

Hebrew present tense usually does not separately distinguish between:

• simple present: we laugh
• present progressive: we are laughing

So:

• אנחנו צוחקים can mean both
• אמא מדברת can mean both Mom talks and Mom is talking

English forces you to choose more often than Hebrew does.

The basic structure is:

גם אנחנו צוחקים | כשאמא מדברת על המסיבה של אתמול

That is:

• גם אנחנו צוחקים = main clause
• כשאמא מדברת על המסיבה של אתמול = time clause

A very natural literal breakdown is:

• also we laugh
• when Mom talks about the party of yesterday

Hebrew word order is fairly flexible, but this order is completely natural.

Yes, it could be omitted in some contexts:

• גם צוחקים כשאמא מדברת על המסיבה של אתמול

But that version is less clear on its own, because צוחקים could refer to we or they depending on context.

So using אנחנו makes the sentence clearer and more natural for an isolated sentence.

Then צוחקים would become צוחקות:

גם אנחנו צוחקות כשאמא מדברת על המסיבה של אתמול.

Everything else stays the same.

That is because only the verb agreeing with אנחנו changes to feminine plural.

Not necessarily.

אמא can mean:

• Mom
• Mum
• mother, depending on context and translation style

In Hebrew, family words like אמא are often used without saying my, just like in English when speaking casually:

• Mom is talking
• אמא מדברת

So אמא here naturally means Mom, not necessarily a mother in a general sense.

It sounds natural and everyday, not especially formal.

Reasons:

• כש is common spoken/written everyday Hebrew
• אמא is informal and family-like
• של אתמול is a normal everyday way to say yesterday’s

A more formal style might use something like כאשר instead of כש, but the given sentence is very normal modern Hebrew.