בקיץ אנחנו יושבים על הגג ורואים את העיר.

ב־ is a prefix meaning in, at, or sometimes during.

So בקיץ means in summer or in the summer.

A useful detail: in fully pointed Hebrew, there is a difference between:

• בְּקַיִץ = in summer
• בַּקַּיִץ = in the summer

But in normal everyday writing without vowels, both are usually written the same way: בקיץ. So you understand the exact nuance from context.

Because in Hebrew, the verb to be is usually not said in the present tense.

So Hebrew says:

• אנחנו יושבים = literally we sitting
• natural English: we are sitting / we sit

This is completely normal Hebrew. The same thing happens with adjectives and nouns too:

• אני עייף = I am tired
• היא מורה = she is a teacher

No present-tense am/is/are is needed.

You often don’t need it. Hebrew verbs in the present tense show number and gender, and in many cases the subject is clear from context.

So these are both possible:

• אנחנו יושבים על הגג
• יושבים על הגג

Including אנחנו can make the sentence clearer, more natural in context, or slightly more emphatic. It is not unusual at all.

They are present-tense forms.

In Hebrew, the present tense can cover both:

• simple present: we sit / we see
• present progressive: we are sitting / we are seeing

So:

• יושבים = sit / are sitting
• רואים = see / are seeing

In this sentence, because it starts with בקיץ, it sounds more like a habitual action: something that happens in summer generally, not necessarily only right now.

Because Hebrew present-tense verbs agree with the subject in gender and number.

Here the forms are masculine plural:

• יושבים
• רואים

This is used when the group is:

• all male, or
• mixed, or
• unspecified in gender

If the speakers were all female, you would say:

• בקיץ אנחנו יושבות על הגג ורואות את העיר.

Also notice that אנחנו itself does not show gender, but the verb forms do.

על means on or on top of.

So:

• על הגג = on the roof

This is the normal preposition here because the idea is that the people are sitting on top of the roof area.

Also:

• הגג = the roof
• ה־ is the Hebrew word the attached as a prefix

So the phrase breaks down like this:

• על = on
• הגג = the roof

את is the Hebrew marker of a definite direct object.

It usually appears before a direct object that is definite, such as:

• a noun with ה־ (the)
• a proper name
• a noun with a possessive ending

So:

• רואים עיר = see a city
• רואים את העיר = see the city

In this sentence, העיר is definite because it means the city, so Hebrew uses את.

Important: this את does not mean with. It is just a grammar marker, and it usually is not translated into English.

Because the sentence is talking about a specific city, not just any city.

• עיר = a city
• העיר = the city

Since the city is definite, Hebrew uses both:

• ה on the noun: העיר
• את before it: את העיר

So רואים את העיר means we see the city.

Because one subject can apply to more than one verb, just like in English.

So:

• אנחנו יושבים על הגג ורואים את העיר

  means:

• We sit on the roof and see the city

The subject אנחנו is understood for both יושבים and רואים.

You could repeat it:

• בקיץ אנחנו יושבים על הגג ואנחנו רואים את העיר

but that sounds more repetitive and is usually unnecessary unless you want special emphasis.

Hebrew word order is fairly flexible, and beginning with בקיץ puts the time setting first.

So this sentence starts by telling you when the action happens:

• בקיץ = in summer / in the summer

That makes the sentence feel like: As for summer... this is what we do.

You could also say:

• אנחנו יושבים על הגג ורואים את העיר בקיץ

but that places the time expression later and changes the emphasis a little. Starting with בקיץ is very natural when the time frame is the main setup for the sentence.