Если завтра придут гости, мы повесим гирлянду у окна и быстро наведём порядок.

and

Breakdown of Если завтра придут гости, мы повесим гирлянду у окна и быстро наведём порядок.

• если: if
• мы: we
• у: by

Questions & Answers about Если завтра придут гости, мы повесим гирлянду у окна и быстро наведём порядок.

Why is придут used after если? In English we say If guests come tomorrow, not if guests will come tomorrow.

Russian and English work differently here.

In Russian, when the condition is about the future, it is normal to use a future verb after если:

• Если завтра придут гости, мы...

In English, we usually use the present after if:

• If guests come tomorrow, we’ll...

So придут is not strange in Russian at all. It is the standard way to talk about a real future condition.

Why is it придут and not приходят?

Because придут is the correct future form here, and it also matches the meaning of a single completed arrival.

• придут = will come / will arrive
• приходят = come / are coming in the present, or come regularly

With завтра, Russian normally wants a future form, not a present habitual form.

Also, прийти → придут is perfective, which fits a one-time event: the guests arrive, and then you react.

Could I also say Если завтра будут гости? What is the difference?