אם נצא עכשיו, לא נפספס מקום טוב על הדשא.

In Hebrew, אם means if, and it is very common to use the future tense after it when talking about a real possibility in the future.

So:

• אם נצא עכשיו = if we leave now

This is different from English, where we usually say if we leave now, not if we will leave now. Hebrew does not follow that English rule here; future forms after אם are normal and natural.

נצא is the 1st person plural future form of the verb לצאת (to go out / to leave).

So:

• לצאת = to leave / to go out
• נצא = we will leave / we will go out

The נ- at the beginning often marks we in the future tense.

Because Hebrew usually does not need a separate subject pronoun when the verb already shows who is doing the action.

• נצא already means we will leave
• נפספס already means we will miss

So אנחנו would usually be unnecessary unless you want emphasis or contrast.

For example:

• אם אנחנו נצא עכשיו... sounds more emphatic, like if we leave now...
• אם נצא עכשיו... is the normal, natural version

נפספס means we will miss in the sense of fail to get, miss out on, or not catch in time.

It comes from the verb לפספס, which is very common in everyday Hebrew.

Examples of how לפספס is used:

• לפספס את האוטובוס = to miss the bus
• לפספס הזדמנות = to miss an opportunity
• לא נפספס מקום טוב = we won’t miss out on a good spot

It is a very useful, common colloquial verb.

Hebrew normally makes future negation by putting לא before the future verb.

So:

• נפספס = we will miss
• לא נפספס = we will not miss

This is straightforward and very common. Hebrew does not need an extra helping verb like English do.

Hebrew has the definite article (ה־ = the), but it does not have a word for a/an.

So:

• מקום can mean a place / a spot or just place / spot, depending on context
• מקום טוב = a good spot / a good place

Since there is no ה־ on מקום, it is indefinite.

Compare:

• מקום טוב = a good spot
• המקום הטוב = the good spot

In Hebrew, adjectives usually come after the noun.

So:

• מקום טוב = a good place / a good spot
• literally: place good

This is the normal word order in Hebrew.

Also, adjectives must match the noun in gender and number:

• מקום is masculine singular
• so the adjective is טוב (masculine singular)

Because they are functioning differently:

• מקום טוב = a good spot (indefinite)
• על הדשא = on the grass / on the lawn (definite)

The speaker is talking about some unspecified good spot, but a specific known area: the grass / the lawn.

In Hebrew, ה־ is attached directly to the noun:

• דשא = grass / lawn
• הדשא = the grass / the lawn

Yes, literally it means on the grass. In natural English, depending on context, it might be translated as:

• on the grass
• on the lawn
• in the grassy area

Hebrew על most often means on, but in context it can sometimes sound more natural in English as at or in.

Here the idea is probably finding a good place to sit or stay in a grassy area, such as in a park or at an event.

It sounds very natural and everyday. Nothing about it is unusually formal.

Especially:

• לפספס is common in spoken Hebrew
• the whole sentence sounds conversational and idiomatic

A native speaker could easily say this in daily life.

A natural pronunciation is roughly:

im netze akhshav, lo nefaspes makom tov al hadeshe

A more careful breakdown:

• אם = im
• נצא = netze
• עכשיו = akhshav
• לא = lo
• נפספס = nefaspes
• מקום = makom
• טוב = tov
• על = al
• הדשא = hadeshe

A few notes:

• עכשיו begins with the guttural letter ע, but many learners first approximate it as akhshav
• צ in נצא sounds like ts
• ש in הדשא here is pronounced sh

Yes, Hebrew allows some flexibility, but the original order is the most natural.

Standard version:

• אם נצא עכשיו, לא נפספס מקום טוב על הדשא.

You could also hear:

• לא נפספס מקום טוב על הדשא אם נצא עכשיו.

That still means the same thing, but it shifts the emphasis a little. The original version is a very normal way to present a condition first and then the result.